Factorial Within Subjects. Psy 420 Ainsworth
|
|
- Agatha Hudson
- 5 years ago
- Views:
Transcription
1 Factorial Within Subjects Psy 40 Ainsworth
2 Factorial WS Designs Analysis Factorial deviation and computational Power, relative efficiency and sample size Effect size Missing data Specific Comparisons
3 Example for Deviation Approach b 1 : Science Fiction b : Mystery Case Means a 1 : Month 1 a : Month a 3 : Month 3 a 1 : Month 1 a : Month a 3 : Month 3 S S 1 = S S = S S 3 = S S 4 = S S 5 = Treatment Means a 1 b 1 =.4 a b 1 = 3.8 a 3 b 1 = 6.4 a 1 b = 5 a b = 5 a 3 b =. GM = 4.133
4 Analysis Deviation What effects do we have? A B AB S AS BS ABS T
5 Analysis Deviation DFs DF A = a 1 DF B = b 1 B DF AB = (a 1)(b 1) DF S = (s 1) DF AS = (a 1)(s 1) DF BS = (b 1)(s 1) DF ABS = (a 1)(b 1)(s 1) DF T = abs - 1
6 Sums of Squares - Deviation The total variability can be partitioned into A, B, AB, Subjects and a Separate Error Variability for Each Effect SS = SS + SS + SS + SS + SS + SS + SS Total A B AB S AS BS ABS ( Y ) ( ) ( ) ijk Y... nj Y. j. Y... nk Y.. k Y... = n ( ) ( ) ( ) jk Y. jk Y... nj Y. j. Y... nk Y.. k Y... ( ) ( ) ( ) ( ) + jk Yi.. Y... + k Yij. Y. j. jk Yi.. Y... + j Yi. k Y. j. jk ( Yi.. Y ) ( ) ( ) Y ( ) ( ) ijk Y. jk jk Yi.. Y... k Yij. Y. j. j Yi. k Y. j.
7 Analysis Deviation Before we can calculate the sums of squares we need to rearrange the data When analyzing the effects of A (Month) you need to AVERAGE over the effects of B (Novel) and vice versa The data in its original form is only useful for calculating the AB and ABS interactions
8 For the A and AS effects Remake data, averaging over B a 1 : Month 1 a : Month a 3 : Month 3 Case Means S S 1 = S S = S S 3 = S S 4 = S S 5 = Treatment Means a 1 = 3.7 a = 4.4 a 3 = 4.3 GM = 4.133
9 (..... ) ( ) ( ) ( ) ( i..... ) (3*)*[( ) ( ) ( ) ( ) ( ) SS = n Y Y = 10*[ ] =.867 A j j S SS = jk Y Y = = (... ) (..... ) ( ij.. j. ) = *[ SS = k Y Y jk Y Y = AS ij j i ( 3 3.7) ( ) ( ) ( 4 3.7) ( ) ( ) ( 6 4.4) ( 4 4.4) ( ) ( 5 4.4) k Y Y ( ) ( ) ( ) ( ) ( ) ] = 0.6 SS AS = = 4.133
10 For B and BS effects Remake data, averaging over A b 1 : Science Fiction b : Mystery Case Means S S 1 = S S = S S 3 = S S 4 = S S 5 = Treatment Means b 1 = 4.00 b = GM = 4.133
11 B k.. k... ( ) ( ) ( ) SS = n Y Y = 15*[ ] =.133 ( ) ( ) SS = j Y Y jk Y Y = BS i k k i ( ) i. k.. k 3*[ ( ) ( ) ( 4 4.) j Y Y = ( ) ( ) ( ) ( ) ( ) + ( ) +( ) ( ) i..... SS = jk Y Y = S ] = 50 SS BS = =
12 For AB and ABS effects Use the data in its original form b 1 : Science Fiction b : Mystery Case Means a 1 : Month 1 a : Month a 3 : Month 3 a 1 : Month 1 a : Month a 3 : Month 3 S S 1 = S S = S S 3 = S S 4 = S S 5 = Treatment Means a 1 b 1 =.4 a b 1 = 3.8 a 3 b 1 = 6.4 a 1 b = 5 a b = 5 a 3 b =. GM = 4.133
13 ( ) ( ) ( ) SS = n Y Y n Y Y n Y Y = AB jk jk j j k k jk ( ) = 5*[ ( ) + ( ) + ( ) n Y Y. jk... ( ) ( ) ( ) ] = ( ) n Y Y = SS = j. j.... A.867 ( ) k.. k... B n Y Y = SS =.133 SS AB = =
14 (. ) (..... ) (... ) (... ) SS ABS = Yijk Y jk jk Yi Y k Yij Y j j Yi k Y j = ( Yijk Y. jk ) ( 1.4) ( 1.4) ( 3.4) = ( 5.4) (.4) ( 3 3.8) ( 4 3.8) ( 3 3.8) ( 5 3.8) ( 4 3.8) ( 6 6.4) ( ) ( ) ( ) ( ) ( 6 5) + ( 8 5) + ( 4 5) + ( 3 5) ( 5 5) ( 4 5) ( 8 5) ( 5 5) ( 5) ( 6 5) ( 1.) ( 4.) ( ) ( ) ( ) = SS ABS = = 9.867
15 Total ( ) ( ) ( ) SS = ( ) ( 4.133) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) + ( ) ( ) ( ) ( 4.133) ( ) ( ) ( ) ( ) ( ) ( ) =
16 Analysis Deviation DFs DF A = a 1 = 3 1 = DF B = b 1 = 1 = 1 B DF AB = (a 1)(b 1) = * 1 = DF S = (s 1) = 5 1 = 4 DF AS = (a 1)(s 1) = * 4 = 8 DF BS = (b 1)(s 1) = 1 * 4 = 4 DF ABS = (a 1)(b 1)(s 1) = * 1 * 4 = 8 DF T = abs 1 = [3*()*(5)] 1 = 30 1 = 9
17 Source Table - Deviation Source SS df MS F A AS B BS AB ABS S Total
18 Analysis Computational Example data re-calculated with totals b 1 : Science Fiction b : Mystery Case Totals a 1 : Month 1 a : Month a 3 : Month 3 a 1 : Month 1 a : Month a 3 : Month 3 S S 1 =0 S S =33 S S 3 =4 S S 4 = S S 5 =5 Treatment Totals a 1 b 1 = 1 a b 1 = 19 a 3 b 1 = 3 a 1 b = 5 a b = 5 a 3 b = 11 T = 14
19 Analysis Computational Before we can calculate the sums of squares we need to rearrange the data When analyzing the effects of A (Month) you need to SUM over the effects of B (Novel) and vice versa The data in its original form is only useful for calculating the AB and ABS interactions
20 Analysis Computational For the Effect of A (Month) and A x S Month a 1 : Month 1 a : Month a 3 : Month 3 Case Totals S S 1 =0 S S =33 S S 3 =4 S S 4 = S S 5 =5 Treatment Totals T = 14
21 SS SS SS SS A A S S ( a j ) ( si ) T = = = bs abs (5) (3)(5) = = = T = = = ab abs (3) 3174 = = = ( a jsi ) ( a j ) ( s i ) T SS AS = + = b bs ab abs SS AS = = = SS = = AS
22 Analysis Traditional For B (Novel) and B x S b 1 : Science Fiction Type of Novel b : Mystery Case Totals S S 1 =0 S 13 0 S =33 S S 3 =4 S S 4 = S S 5 =5 Treatment Totals T = 14
23 SS SS B B ( b ) k T = = = as abs 3(5) = = ( ) ( ) ( ) k i k i b s b s T SSBS = + = a as ab abs SSBS = = SS BS SS BS 1688 = = =
24 Analysis Computational Example data re-calculated with totals b 1 : Science Fiction b : Mystery Case Totals a 1 : Month 1 a : Month a 3 : Month 3 a 1 : Month 1 a : Month a 3 : Month 3 S S 1 =0 S S =33 S S 3 =4 S S 4 = S S 5 =5 Treatment Totals a 1 b 1 = 1 a b 1 = 19 a 3 b 1 = 3 a 1 b = 5 a b = 5 a 3 b = 11 T = 14
25 SS SS SS SS AB AB AB AB ( j k ) ( j ) ( k ) a b a b T = + = s bs as abs = = = = 5 = = SS + SS ABS ( a jbk ) ( a jsi ) ( bk si ) ( a j ) ( k ) ( i ) ABS = Y + s b a b s T + + = bs as ab abs = = SS Total T abs = Y = =
26 DFs Analysis Computational DFs are the same DF A = a 1 = 3 1 = DF B = b 1 = 1 = 1 B DF AB = (a 1)(b 1) = * 1 = DF S = (s 1) = 5 1 = 4 DF AS = (a 1)(s 1) = * 4 = 8 DF BS = (b 1)(s 1) = 1 * 4 = 4 DF ABS = (a 1)(b 1)(s 1) = * 1 * 4 = 8 DF T = abs 1 = [3*()*(5)] 1 = 30 1 = 9
27 Source Table Computational Is also the same Source SS df MS F A AS B BS AB ABS S Total
28 Relative Efficiency One way of conceptualizing the power of a within subjects design is to calculate how efficient (uses less subjects) the design is compared to a between subjects design One way of increasing power is to minimize error, which is what WS designs do, compared to BG designs WS designs are more powerful, require less subjects, therefore are more efficient
29 Relative Efficiency Efficiency is not an absolute value in terms of how it s calculated In short, efficiency is a measure of how much smaller the WS error term is compared to the BG error term Remember that in a one-way WS design: SS AS =SS S/A - SS S
30 Relative Efficiency Relative Efficiency = MS S / A df AS + 1 dfs / A + 3 MS AS df AS + 3 dfs / A + 1 MS S/A can be found by either re-running the analysis as a BG design or for one-way: SS S + SS AS = SS S/A and df S + df AS = df S/A MS S / A = s 1 MS + a 1 s 1 MS ( ) ( )( ) S as 1 AS
31 Relative Efficiency From our one-way example: Source SS df MS F A S AxS Total SS = SS + SS = = 19. S / A S AS df = df + df = = 1 MS S / A S AS S / A = 19. /1 = 1.6
32 Relative Efficiency Relative Efficiency = = From the example, the within subjects design is roughly 6% more efficient than a between subjects design (controlling for degrees of freedom) For # of BG subjects (n) to match WS (s) efficiency: n = s(relative efficiency) = 5(1.6) = 6.3 7
33 Power and Sample Size Estimating sample size is the same from before For a one-way within subjects you have and AS interaction but you only estimate sample size based on the main effect For factorial designs you need to estimate sample size based on each effect and use the largest estimate Realize that if it (PC-Size, formula) estimates 5 subjects, that total, not per cell as with BG designs
34 Effects Size Because of the risk of a true AS interaction we need to estimate lower and upper bound estimates η ϖˆ SS = η = = SS A A L SSTotal SS A + SSS + SS AS partial L = partial η df ( MS MS ) df ( MS MS ) + as( MS ) + s( MS ) ϖˆ SS SS A SS + SS SS + SS A = = A error A AS A A AS A A AS AS S = df ( MS MS ) A A AS df ( MS MS ) + as( MS ) A A AS AS
35 Missing Values In repeated measures designs it is often the case that the subjects may not have scores at all levels (e.g. inadmissible score, drop- out, etc.) The default in most programs is to delete the case if it doesn t have complete scores at all levels If you have a lot of data that s fine If you only have a limited cases
36 Missing Values Estimating values for missing cases in WS designs (one method: takes mean of A j, mean for the case and the grand mean) Y * ij * ij ' i ' j ' = where : Y s S a A T = = = = ss + aa T ' ' ' i j ( a 1)( s 1) predicted score to replace missing score number of cases sum of known values for that case number of levels of A = sum of known values for A = sum of all known values
37 Specific Comparisons F-tests for comparisons are exactly the same as for BG F n ( w Y ) / w j j j = MS error Except that MS error is not just MS AS, it is going to be different for every comparison It is recommended to just calculate this through SPSS
Mixed Designs: Between and Within. Psy 420 Ainsworth
Mixed Designs: Between and Within Psy 420 Ainsworth Mixed Between and Within Designs Conceptualizing the Design Types of Mixed Designs Assumptions Analysis Deviation Computation Higher order mixed designs
More informationANCOVA. Lecture 9 Andrew Ainsworth
ANCOVA Lecture 9 Andrew Ainsworth What is ANCOVA? Analysis of covariance an extension of ANOVA in which main effects and interactions are assessed on DV scores after the DV has been adjusted for by the
More informationANCOVA. Psy 420 Andrew Ainsworth
ANCOVA Psy 420 Andrew Ainsworth What is ANCOVA? Analysis of covariance an extension of ANOVA in which main effects and interactions are assessed on DV scores after the DV has been adjusted for by the DV
More informationFactorial BG ANOVA. Psy 420 Ainsworth
Factorial BG ANOVA Psy 420 Ainsworth Topics in Factorial Designs Factorial? Crossing and Nesting Assumptions Analysis Traditional and Regression Approaches Main Effects of IVs Interactions among IVs Higher
More informationIn a one-way ANOVA, the total sums of squares among observations is partitioned into two components: Sums of squares represent:
Activity #10: AxS ANOVA (Repeated subjects design) Resources: optimism.sav So far in MATH 300 and 301, we have studied the following hypothesis testing procedures: 1) Binomial test, sign-test, Fisher s
More informationOne-way Analysis of Variance. Major Points. T-test. Ψ320 Ainsworth
One-way Analysis of Variance Ψ30 Ainsworth Major Points Problem with t-tests and multiple groups The logic behind ANOVA Calculations Multiple comparisons Assumptions of analysis of variance Effect Size
More informationCS 147: Computer Systems Performance Analysis
CS 147: Computer Systems Performance Analysis CS 147: Computer Systems Performance Analysis 1 / 34 Overview Overview Overview Adding Replications Adding Replications 2 / 34 Two-Factor Design Without Replications
More information10/31/2012. One-Way ANOVA F-test
PSY 511: Advanced Statistics for Psychological and Behavioral Research 1 1. Situation/hypotheses 2. Test statistic 3.Distribution 4. Assumptions One-Way ANOVA F-test One factor J>2 independent samples
More informationFactorial designs. Experiments
Chapter 5: Factorial designs Petter Mostad mostad@chalmers.se Experiments Actively making changes and observing the result, to find causal relationships. Many types of experimental plans Measuring response
More information3. Factorial Experiments (Ch.5. Factorial Experiments)
3. Factorial Experiments (Ch.5. Factorial Experiments) Hae-Jin Choi School of Mechanical Engineering, Chung-Ang University DOE and Optimization 1 Introduction to Factorials Most experiments for process
More informationChapter 12. Analysis of variance
Serik Sagitov, Chalmers and GU, January 9, 016 Chapter 1. Analysis of variance Chapter 11: I = samples independent samples paired samples Chapter 1: I 3 samples of equal size J one-way layout two-way layout
More informationpsyc3010 lecture 2 factorial between-ps ANOVA I: omnibus tests
psyc3010 lecture 2 factorial between-ps ANOVA I: omnibus tests last lecture: introduction to factorial designs next lecture: factorial between-ps ANOVA II: (effect sizes and follow-up tests) 1 general
More informationTwo-Way Analysis of Variance - no interaction
1 Two-Way Analysis of Variance - no interaction Example: Tests were conducted to assess the effects of two factors, engine type, and propellant type, on propellant burn rate in fired missiles. Three engine
More informationChapter 11: Factorial Designs
Chapter : Factorial Designs. Two factor factorial designs ( levels factors ) This situation is similar to the randomized block design from the previous chapter. However, in addition to the effects within
More information20.1. Balanced One-Way Classification Cell means parametrization: ε 1. ε I. + ˆɛ 2 ij =
20. ONE-WAY ANALYSIS OF VARIANCE 1 20.1. Balanced One-Way Classification Cell means parametrization: Y ij = µ i + ε ij, i = 1,..., I; j = 1,..., J, ε ij N(0, σ 2 ), In matrix form, Y = Xβ + ε, or 1 Y J
More information8/23/2018. One-Way ANOVA F-test. 1. Situation/hypotheses. 2. Test statistic. 3.Distribution. 4. Assumptions
PSY 5101: Advanced Statistics for Psychological and Behavioral Research 1 1. Situation/hypotheses 2. Test statistic One-Way ANOVA F-test One factor J>2 independent samples H o :µ 1 µ 2 µ J F 3.Distribution
More informationPsy 420 Final Exam Fall 06 Ainsworth. Key Name
Psy 40 Final Exam Fall 06 Ainsworth Key Name Psy 40 Final A researcher is studying the effect of Yoga, Meditation, Anti-Anxiety Drugs and taking Psy 40 and the anxiety levels of the participants. Twenty
More informationLec 5: Factorial Experiment
November 21, 2011 Example Study of the battery life vs the factors temperatures and types of material. A: Types of material, 3 levels. B: Temperatures, 3 levels. Example Study of the battery life vs the
More informationChapter 4: Randomized Blocks and Latin Squares
Chapter 4: Randomized Blocks and Latin Squares 1 Design of Engineering Experiments The Blocking Principle Blocking and nuisance factors The randomized complete block design or the RCBD Extension of the
More informationAnalysis of Variance (ANOVA)
Analysis of Variance (ANOVA) Two types of ANOVA tests: Independent measures and Repeated measures Comparing 2 means: X 1 = 20 t - test X 2 = 30 How can we Compare 3 means?: X 1 = 20 X 2 = 30 X 3 = 35 ANOVA
More informationIntroduction to the Analysis of Variance (ANOVA) Computing One-Way Independent Measures (Between Subjects) ANOVAs
Introduction to the Analysis of Variance (ANOVA) Computing One-Way Independent Measures (Between Subjects) ANOVAs The Analysis of Variance (ANOVA) The analysis of variance (ANOVA) is a statistical technique
More informationSTAT 705 Chapter 19: Two-way ANOVA
STAT 705 Chapter 19: Two-way ANOVA Adapted from Timothy Hanson Department of Statistics, University of South Carolina Stat 705: Data Analysis II 1 / 41 Two-way ANOVA This material is covered in Sections
More informationSTAT 705 Chapter 19: Two-way ANOVA
STAT 705 Chapter 19: Two-way ANOVA Timothy Hanson Department of Statistics, University of South Carolina Stat 705: Data Analysis II 1 / 38 Two-way ANOVA Material covered in Sections 19.2 19.4, but a bit
More informationTheorem A: Expectations of Sums of Squares Under the two-way ANOVA model, E(X i X) 2 = (µ i µ) 2 + n 1 n σ2
identity Y ijk Ȳ = (Y ijk Ȳij ) + (Ȳi Ȳ ) + (Ȳ j Ȳ ) + (Ȳij Ȳi Ȳ j + Ȳ ) Theorem A: Expectations of Sums of Squares Under the two-way ANOVA model, (1) E(MSE) = E(SSE/[IJ(K 1)]) = (2) E(MSA) = E(SSA/(I
More informationy = µj n + β 1 b β b b b + α 1 t α a t a + e
The contributions of distinct sets of explanatory variables to the model are typically captured by breaking up the overall regression (or model) sum of squares into distinct components This is useful quite
More informationAn Old Research Question
ANOVA An Old Research Question The impact of TV on high-school grade Watch or not watch Two groups The impact of TV hours on high-school grade Exactly how much TV watching would make difference Multiple
More informationStat 511 HW#10 Spring 2003 (corrected)
Stat 511 HW#10 Spring 003 (corrected) 1. Below is a small set of fake unbalanced -way factorial (in factors A and B) data from (unbalanced) blocks. Level of A Level of B Block Response 1 1 1 9.5 1 1 11.3
More informationStatistics For Economics & Business
Statistics For Economics & Business Analysis of Variance In this chapter, you learn: Learning Objectives The basic concepts of experimental design How to use one-way analysis of variance to test for differences
More informationWELCOME! Lecture 13 Thommy Perlinger
Quantitative Methods II WELCOME! Lecture 13 Thommy Perlinger Parametrical tests (tests for the mean) Nature and number of variables One-way vs. two-way ANOVA One-way ANOVA Y X 1 1 One dependent variable
More informationCHAPTER 7 - FACTORIAL ANOVA
Between-S Designs Factorial 7-1 CHAPTER 7 - FACTORIAL ANOVA Introduction to Factorial Designs................................................. 2 A 2 x 2 Factorial Example.......................................................
More informationOrthogonal contrasts for a 2x2 factorial design Example p130
Week 9: Orthogonal comparisons for a 2x2 factorial design. The general two-factor factorial arrangement. Interaction and additivity. ANOVA summary table, tests, CIs. Planned/post-hoc comparisons for the
More informationRandomized Blocks, Latin Squares, and Related Designs. Dr. Mohammad Abuhaiba 1
Randomized Blocks, Latin Squares, and Related Designs Dr. Mohammad Abuhaiba 1 HomeWork Assignment Due Sunday 2/5/2010 Solve the following problems at the end of chapter 4: 4-1 4-7 4-12 4-14 4-16 Dr. Mohammad
More informationThe One-Way Repeated-Measures ANOVA. (For Within-Subjects Designs)
The One-Way Repeated-Measures ANOVA (For Within-Subjects Designs) Logic of the Repeated-Measures ANOVA The repeated-measures ANOVA extends the analysis of variance to research situations using repeated-measures
More informationDESAIN EKSPERIMEN BLOCKING FACTORS. Semester Genap 2017/2018 Jurusan Teknik Industri Universitas Brawijaya
DESAIN EKSPERIMEN BLOCKING FACTORS Semester Genap Jurusan Teknik Industri Universitas Brawijaya Outline The Randomized Complete Block Design The Latin Square Design The Graeco-Latin Square Design Balanced
More informationCOMPLETELY RANDOM DESIGN (CRD) -Design can be used when experimental units are essentially homogeneous.
COMPLETELY RANDOM DESIGN (CRD) Description of the Design -Simplest design to use. -Design can be used when experimental units are essentially homogeneous. -Because of the homogeneity requirement, it may
More informationANOVA Randomized Block Design
Biostatistics 301 ANOVA Randomized Block Design 1 ORIGIN 1 Data Structure: Let index i,j indicate the ith column (treatment class) and jth row (block). For each i,j combination, there are n replicates.
More informationChapter 13 Experiments with Random Factors Solutions
Solutions from Montgomery, D. C. (01) Design and Analysis of Experiments, Wiley, NY Chapter 13 Experiments with Random Factors Solutions 13.. An article by Hoof and Berman ( Statistical Analysis of Power
More informationOne-Way ANOVA Cohen Chapter 12 EDUC/PSY 6600
One-Way ANOVA Cohen Chapter 1 EDUC/PSY 6600 1 It is easy to lie with statistics. It is hard to tell the truth without statistics. -Andrejs Dunkels Motivating examples Dr. Vito randomly assigns 30 individuals
More informationKeppel, G. & Wickens, T.D. Design and Analysis Chapter 2: Sources of Variability and Sums of Squares
Keppel, G. & Wickens, T.D. Design and Analysis Chapter 2: Sources of Variability and Sums of Squares K&W introduce the notion of a simple experiment with two conditions. Note that the raw data (p. 16)
More informationWITHIN-PARTICIPANT EXPERIMENTAL DESIGNS
1 WITHIN-PARTICIPANT EXPERIMENTAL DESIGNS I. Single-factor designs: the model is: yij i j ij ij where: yij score for person j under treatment level i (i = 1,..., I; j = 1,..., n) overall mean βi treatment
More informationAnalysis of Variance (ANOVA)
Analysis of Variance ANOVA) Compare several means Radu Trîmbiţaş 1 Analysis of Variance for a One-Way Layout 1.1 One-way ANOVA Analysis of Variance for a One-Way Layout procedure for one-way layout Suppose
More informationAdvanced Experimental Design
Advanced Experimental Design Topic 8 Chapter : Repeated Measures Analysis of Variance Overview Basic idea, different forms of repeated measures Partialling out between subjects effects Simple repeated
More informationChap The McGraw-Hill Companies, Inc. All rights reserved.
11 pter11 Chap Analysis of Variance Overview of ANOVA Multiple Comparisons Tests for Homogeneity of Variances Two-Factor ANOVA Without Replication General Linear Model Experimental Design: An Overview
More informationDesign & Analysis of Experiments 7E 2009 Montgomery
Chapter 5 1 Introduction to Factorial Design Study the effects of 2 or more factors All possible combinations of factor levels are investigated For example, if there are a levels of factor A and b levels
More informationLecture 6: Single-classification multivariate ANOVA (k-group( MANOVA)
Lecture 6: Single-classification multivariate ANOVA (k-group( MANOVA) Rationale and MANOVA test statistics underlying principles MANOVA assumptions Univariate ANOVA Planned and unplanned Multivariate ANOVA
More informationSTAT 135 Lab 10 Two-Way ANOVA, Randomized Block Design and Friedman s Test
STAT 135 Lab 10 Two-Way ANOVA, Randomized Block Design and Friedman s Test Rebecca Barter April 13, 2015 Let s now imagine a dataset for which our response variable, Y, may be influenced by two factors,
More informationQUEEN MARY, UNIVERSITY OF LONDON
QUEEN MARY, UNIVERSITY OF LONDON MTH634 Statistical Modelling II Solutions to Exercise Sheet 4 Octobe07. We can write (y i. y.. ) (yi. y i.y.. +y.. ) yi. y.. S T. ( Ti T i G n Ti G n y i. +y.. ) G n T
More informationDr. Shalabh Department of Mathematics and Statistics Indian Institute of Technology Kanpur
nalysis of Variance and Design of Experiment-I MODULE V LECTURE - 9 FCTORIL EXPERIMENTS Dr. Shalabh Department of Mathematics and Statistics Indian Institute of Technology Kanpur Sums of squares Suppose
More informationVariance Estimates and the F Ratio. ERSH 8310 Lecture 3 September 2, 2009
Variance Estimates and the F Ratio ERSH 8310 Lecture 3 September 2, 2009 Today s Class Completing the analysis (the ANOVA table) Evaluating the F ratio Errors in hypothesis testing A complete numerical
More informationSTAT Final Practice Problems
STAT 48 -- Final Practice Problems.Out of 5 women who had uterine cancer, 0 claimed to have used estrogens. Out of 30 women without uterine cancer 5 claimed to have used estrogens. Exposure Outcome (Cancer)
More informationAnalysis of Variance. One-way analysis of variance (anova) shows whether j groups have significantly different means. X=10 S=1.14 X=5.8 X=2.4 X=9.
Analysis of Variance One-way analysis of variance (anova) shows whether j groups have significantly different means. A B C D 3 6 7 8 2 4 9 10 2 7 12 11 4 5 11 9 1 7 10 12 X=2.4 X=5.8 X=9.8 X=10 S=1.14
More informationUnit 7: Random Effects, Subsampling, Nested and Crossed Factor Designs
Unit 7: Random Effects, Subsampling, Nested and Crossed Factor Designs STA 643: Advanced Experimental Design Derek S. Young 1 Learning Objectives Understand how to interpret a random effect Know the different
More informationAnalysis of variance
Analysis of variance 1 Method If the null hypothesis is true, then the populations are the same: they are normal, and they have the same mean and the same variance. We will estimate the numerical value
More informationResearch Methods II MICHAEL BERNSTEIN CS 376
Research Methods II MICHAEL BERNSTEIN CS 376 Goal Understand and use statistical techniques common to HCI research 2 Last time How to plan an evaluation What is a statistical test? Chi-square t-test Paired
More informationMultiple Regression. More Hypothesis Testing. More Hypothesis Testing The big question: What we really want to know: What we actually know: We know:
Multiple Regression Ψ320 Ainsworth More Hypothesis Testing What we really want to know: Is the relationship in the population we have selected between X & Y strong enough that we can use the relationship
More informationOne-Way Analysis of Variance. With regression, we related two quantitative, typically continuous variables.
One-Way Analysis of Variance With regression, we related two quantitative, typically continuous variables. Often we wish to relate a quantitative response variable with a qualitative (or simply discrete)
More informationiron retention (log) high Fe2+ medium Fe2+ high Fe3+ medium Fe3+ low Fe2+ low Fe3+ 2 Two-way ANOVA
iron retention (log) 0 1 2 3 high Fe2+ high Fe3+ low Fe2+ low Fe3+ medium Fe2+ medium Fe3+ 2 Two-way ANOVA In the one-way design there is only one factor. What if there are several factors? Often, we are
More informationComparing Several Means: ANOVA
Comparing Several Means: ANOVA Understand the basic principles of ANOVA Why it is done? What it tells us? Theory of one way independent ANOVA Following up an ANOVA: Planned contrasts/comparisons Choosing
More informationFACTORIAL DESIGNS and NESTED DESIGNS
Experimental Design and Statistical Methods Workshop FACTORIAL DESIGNS and NESTED DESIGNS Jesús Piedrafita Arilla jesus.piedrafita@uab.cat Departament de Ciència Animal i dels Aliments Items Factorial
More information3. Design Experiments and Variance Analysis
3. Design Experiments and Variance Analysis Isabel M. Rodrigues 1 / 46 3.1. Completely randomized experiment. Experimentation allows an investigator to find out what happens to the output variables when
More informationOutline Topic 21 - Two Factor ANOVA
Outline Topic 21 - Two Factor ANOVA Data Model Parameter Estimates - Fall 2013 Equal Sample Size One replicate per cell Unequal Sample size Topic 21 2 Overview Now have two factors (A and B) Suppose each
More informationOne-way between-subjects ANOVA. Comparing three or more independent means
One-way between-subjects ANOVA Comparing three or more independent means ANOVA: A Framework Understand the basic principles of ANOVA Why it is done? What it tells us? Theory of one-way between-subjects
More informationOne-factor analysis of variance (ANOVA)
One-factor analysis of variance (ANOVA) March 1, 2017 psych10.stanford.edu Announcements / Action Items Schedule update: final R lab moved to Week 10 Optional Survey 5 coming soon, due on Saturday Last
More informationFactorial and Unbalanced Analysis of Variance
Factorial and Unbalanced Analysis of Variance Nathaniel E. Helwig Assistant Professor of Psychology and Statistics University of Minnesota (Twin Cities) Updated 04-Jan-2017 Nathaniel E. Helwig (U of Minnesota)
More informationDefinitions of terms and examples. Experimental Design. Sampling versus experiments. For each experimental unit, measures of the variables of
Experimental Design Sampling versus experiments similar to sampling and inventor design in that information about forest variables is gathered and analzed experiments presuppose intervention through appling
More informationTopic 9: Factorial treatment structures. Introduction. Terminology. Example of a 2x2 factorial
Topic 9: Factorial treatment structures Introduction A common objective in research is to investigate the effect of each of a number of variables, or factors, on some response variable. In earlier times,
More information" M A #M B. Standard deviation of the population (Greek lowercase letter sigma) σ 2
Notation and Equations for Final Exam Symbol Definition X The variable we measure in a scientific study n The size of the sample N The size of the population M The mean of the sample µ The mean of the
More informationFormal Statement of Simple Linear Regression Model
Formal Statement of Simple Linear Regression Model Y i = β 0 + β 1 X i + ɛ i Y i value of the response variable in the i th trial β 0 and β 1 are parameters X i is a known constant, the value of the predictor
More informationLecture Week 1 Basic Principles of Scientific Research
Lecture Week 1 Basic Principles of Scientific Research Intoduction to Research Methods & Statistics 013 014 Hemmo Smit Overview of this lecture Introduction Course information What is science? The empirical
More informationVladimir Spokoiny Design of Experiments in Science and Industry
W eierstraß-institut für Angew andte Analysis und Stochastik Vladimir Spokoiny Design of Experiments in Science and Industry www.ndt.net/index.php?id=8310 Mohrenstr. 39, 10117 Berlin spokoiny@wias-berlin.de
More informationDESAIN EKSPERIMEN Analysis of Variances (ANOVA) Semester Genap 2017/2018 Jurusan Teknik Industri Universitas Brawijaya
DESAIN EKSPERIMEN Analysis of Variances (ANOVA) Semester Jurusan Teknik Industri Universitas Brawijaya Outline Introduction The Analysis of Variance Models for the Data Post-ANOVA Comparison of Means Sample
More informationChapter 8: Hypothesis Testing Lecture 9: Likelihood ratio tests
Chapter 8: Hypothesis Testing Lecture 9: Likelihood ratio tests Throughout this chapter we consider a sample X taken from a population indexed by θ Θ R k. Instead of estimating the unknown parameter, we
More informationNesting and Mixed Effects: Part I. Lukas Meier, Seminar für Statistik
Nesting and Mixed Effects: Part I Lukas Meier, Seminar für Statistik Where do we stand? So far: Fixed effects Random effects Both in the factorial context Now: Nested factor structure Mixed models: a combination
More informationChapter 5 Introduction to Factorial Designs Solutions
Solutions from Montgomery, D. C. (1) Design and Analysis of Experiments, Wiley, NY Chapter 5 Introduction to Factorial Designs Solutions 5.1. The following output was obtained from a computer program that
More informationResearch Methodology: Tools
MSc Business Administration Research Methodology: Tools Applied Data Analysis (with SPSS) Lecture 09: Introduction to Analysis of Variance (ANOVA) April 2014 Prof. Dr. Jürg Schwarz Lic. phil. Heidi Bruderer
More informationOne-way between-subjects ANOVA. Comparing three or more independent means
One-way between-subjects ANOVA Comparing three or more independent means Data files SpiderBG.sav Attractiveness.sav Homework: sourcesofself-esteem.sav ANOVA: A Framework Understand the basic principles
More informationReference: Chapter 14 of Montgomery (8e)
Reference: Chapter 14 of Montgomery (8e) 99 Maghsoodloo The Stage Nested Designs So far emphasis has been placed on factorial experiments where all factors are crossed (i.e., it is possible to study the
More informationAnalyses of Variance and Covariance as General Linear Models
Chapter 16 Analyses of Variance and Covariance as General Linear Models Objectives To show how the analysis of variance can be viewed as a special case of multiple regression; to present procedures for
More information8/04/2011. last lecture: correlation and regression next lecture: standard MR & hierarchical MR (MR = multiple regression)
psyc3010 lecture 7 analysis of covariance (ANCOVA) last lecture: correlation and regression next lecture: standard MR & hierarchical MR (MR = multiple regression) 1 announcements quiz 2 correlation and
More informationMAT3378 ANOVA Summary
MAT3378 ANOVA Summary April 18, 2016 Before you do the analysis: How many factors? (one-factor/one-way ANOVA, two-factor ANOVA etc.) Fixed or Random or Mixed effects? Crossed-factors; nested factors or
More informationDesign of Engineering Experiments Chapter 5 Introduction to Factorials
Design of Engineering Experiments Chapter 5 Introduction to Factorials Text reference, Chapter 5 page 170 General principles of factorial experiments The two-factor factorial with fixed effects The ANOVA
More information1. The (dependent variable) is the variable of interest to be measured in the experiment.
Chapter 10 Analysis of variance (ANOVA) 10.1 Elements of a designed experiment 1. The (dependent variable) is the variable of interest to be measured in the experiment. 2. are those variables whose effect
More informationsame hypothesis Assumptions N = subjects K = groups df 1 = between (numerator) df 2 = within (denominator)
compiled by Janine Lim, EDRM 61, Spring 008 This file is copyrighted (010) and a part of my Leadership Portfolio found at http://www.janinelim.com/leadportfolio. It is shared for your learning use only.
More information8/28/2017. Repeated-Measures ANOVA. 1. Situation/hypotheses. 2. Test statistic. 3.Distribution. 4. Assumptions
PSY 5101: Advanced Statistics for Psychological and Behavioral Research 1 Rationale of Repeated Measures ANOVA One-way and two-way Benefits Partitioning Variance Statistical Problems with Repeated- Measures
More information2 and F Distributions. Barrow, Statistics for Economics, Accounting and Business Studies, 4 th edition Pearson Education Limited 2006
and F Distributions Lecture 9 Distribution The distribution is used to: construct confidence intervals for a variance compare a set of actual frequencies with expected frequencies test for association
More informationThree-Way Contingency Tables
Newsom PSY 50/60 Categorical Data Analysis, Fall 06 Three-Way Contingency Tables Three-way contingency tables involve three binary or categorical variables. I will stick mostly to the binary case to keep
More informationSTAT 506: Randomized complete block designs
STAT 506: Randomized complete block designs Timothy Hanson Department of Statistics, University of South Carolina STAT 506: Introduction to Experimental Design 1 / 10 Randomized complete block designs
More informationMULTIVARIATE ANALYSIS OF VARIANCE
MULTIVARIATE ANALYSIS OF VARIANCE RAJENDER PARSAD AND L.M. BHAR Indian Agricultural Statistics Research Institute Library Avenue, New Delhi - 0 0 lmb@iasri.res.in. Introduction In many agricultural experiments,
More informationLecture 3: Analysis of Variance II
Lecture 3: Analysis of Variance II http://www.stats.ox.ac.uk/ winkel/phs.html Dr Matthias Winkel 1 Outline I. A second introduction to two-way ANOVA II. Repeated measures design III. Independent versus
More informationStatistics 210 Part 3 Statistical Methods Hal S. Stern Department of Statistics University of California, Irvine
Thus far: Statistics 210 Part 3 Statistical Methods Hal S. Stern Department of Statistics University of California, Irvine sternh@uci.edu design of experiments two sample methods one factor ANOVA pairing/blocking
More informationSTAT 115:Experimental Designs
STAT 115:Experimental Designs Josefina V. Almeda 2013 Multisample inference: Analysis of Variance 1 Learning Objectives 1. Describe Analysis of Variance (ANOVA) 2. Explain the Rationale of ANOVA 3. Compare
More informationAnalysis of Variance
Analysis of Variance Blood coagulation time T avg A 62 60 63 59 61 B 63 67 71 64 65 66 66 C 68 66 71 67 68 68 68 D 56 62 60 61 63 64 63 59 61 64 Blood coagulation time A B C D Combined 56 57 58 59 60 61
More informationFood consumption of rats. Two-way vs one-way vs nested ANOVA
Food consumption of rats Lard Gender Fresh Rancid 709 592 Male 679 538 699 476 657 508 Female 594 505 677 539 Two-way vs one-way vs nested NOV T 1 2 * * M * * * * * * F * * * * T M1 M2 F1 F2 * * * * *
More informationPLS205 Lab 6 February 13, Laboratory Topic 9
PLS205 Lab 6 February 13, 2014 Laboratory Topic 9 A word about factorials Specifying interactions among factorial effects in SAS The relationship between factors and treatment Interpreting results of an
More informationAnalysis of Variance: Repeated measures
Repeated-Measures ANOVA: Analysis of Variance: Repeated measures Each subject participates in all conditions in the experiment (which is why it is called repeated measures). A repeated-measures ANOVA is
More informationStat 6640 Solution to Midterm #2
Stat 6640 Solution to Midterm #2 1. A study was conducted to examine how three statistical software packages used in a statistical course affect the statistical competence a student achieves. At the end
More informationChapter 6 Randomized Block Design Two Factor ANOVA Interaction in ANOVA
Chapter 6 Randomized Block Design Two Factor ANOVA Interaction in ANOVA Two factor (two way) ANOVA Two factor ANOVA is used when: Y is a quantitative response variable There are two categorical explanatory
More informationFactorial Treatment Structure: Part I. Lukas Meier, Seminar für Statistik
Factorial Treatment Structure: Part I Lukas Meier, Seminar für Statistik Factorial Treatment Structure So far (in CRD), the treatments had no structure. So called factorial treatment structure exists if
More informationFactorial ANOVA. Psychology 3256
Factorial ANOVA Psychology 3256 Made up data.. Say you have collected data on the effects of Retention Interval 5 min 1 hr 24 hr on memory So, you do the ANOVA and conclude that RI affects memory % corr
More informationCalculating Fobt for all possible combinations of variances for each sample Calculating the probability of (F) for each different value of Fobt
PSY 305 Module 5-A AVP Transcript During the past two modules, you have been introduced to inferential statistics. We have spent time on z-tests and the three types of t-tests. We are now ready to move
More information