Data Visualization (DSC 530/CIS )

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1 Data Visualization (DSC 530/CIS ) Tables Dr. David Koop

2 Visualization of Tables Items and attributes For now, attributes are not known to be positions Keys and values - key is an independent attribute that is unique and identifies item - value tells some aspect of an item Keys: categorical/ordinal Values: +quantitative Levels: unique values of categorical or ordered attributes Items (rows) Attributes (columns) Cell containing value Multidimensional Table Value in cell [Munzner (ill. Maguire), 2014] 2

3 Express Values: Scatterplots Prices in 1980 Fish Prices over the Years Prices in 1970 Data: two quantitative values Task: find trends, clusters, outliers How: marks at spatial position in horizontal and vertical directions Correlation: dependence between two attributes - Positive and negative correlation - Indicated by lines Coordinate system (axes) and labels are important! 3

4 Log-Log Plot n dist [Wickham, 2014]

5 Bubble Plot Bubbles FACTS TEACH ABOUT HOW TO USE Share! " # $ English years Color World Regions Select Search... Afghanistan Life expectancy Albania Algeria Andorra Angola Antigua and Barbuda Size Population, total Zoom 100% OPTIONS EXPAND PRESENT [Gapminder, Wealth & Health of Nations] 5

6 Project Proposal Information Due Next Monday, March 5 Choices: - [CreateVis] Create a complex, interactive visualization of a dataset - [Research] Research project that involves visualization (new technique, evaluation, etc.) Check with me if you're interested in the research project option Start: - [CreateVis] Looking for a dataset: Awesome Public Datasets, Kaggle, etc. - [Research] Surveying literature, identifying goals 6

7 Separate, Order, and Align: Categorical Regions Categorical: =,!= Spatial position can be used for categorical attributes Use regions, distinct contiguous bounded areas, to encode categorical attributes Three operations on the regions: - Separate (use categorical attribute) - Align - Order (use some other ordered attribute) Alignment and order can use same or different attribute 7

8 List Alignment: Bar Charts Data: one quantitative attribute, one categorical attribute Task: lookup & compare values How: line marks, vertical position (quantitative), horizontal position (categorical) What about length? Ordering criteria: alphabetical or using quantitative attribute Scalability: distinguishability - bars at least one pixel wide - hundreds Animal Type Animal Type [Munzner (ill. Maguire), 2014] 8

9 Streamgraphs Include a time attribute Data: multidimensional table, one quantitative attribute (count), one ordered key attribute (time), one categorical key attribute + derived attribute: layer ordering (quantitative) Task: analyze trends in time, find (maxmial) outliers How: derived position+geometry, length, color Scalability: more categories than stacked bar charts fig 2 films from the summer of 2007 [Byron and Wattenberg, 2012] 9

10 Streamgraphs [Ebb and Flow of Movies, M. Bloch et al., New York Times, 2008] 10

11 Dot and Line Charts Year Data: one quantitative attribute, one ordered attribute Task: lookup values, find outliers and trends How: point mark and positions Line Charts: add connection mark (line) Similar to scatterplots but allow ordered attribute Year [Munzner (ill. Maguire), 2014] 11

12 Proper Use of Line and Bar Charts Female Lion Antelope Panda Male Female Lion Antelope Male year-olds 12-year-olds 0 10-year-olds 12-year-olds [Adapted from Zacks and Tversky, 1999, Munzner (ill. Maguire), 2014] 12

13 Proper Use of Line and Bar Charts Female Lion Antelope Panda Male Female Lion Antelope Male What does the line indicate? Does this make sense? [Adapted from Zacks and Tversky, 1999, Munzner (ill. Maguire), 2014] 13

14 Aspect Ratio Trends in line charts are more apparent because we are using angle as a channel Perception of angle (and the relative difference between angles) is important Initial experiments found people best judge differences in slope when angles are around 45 degrees (Cleveland et al., 1988, 1993) 14

15 Multiscale Banking 706 IEEE TRANSACTIONS ON VISUALIZATIO Sunspot Cycles Aspect Ratio = 3.96 Aspect Ratio = Power Spectrum [Heer and Agrawala, 2006] 15

16 Multiscale Banking ON AND COMPUTER GRAPHICS, VOL. 12, NO. 5, SEPTEMBER/OCTOBER 2006 PRMTX Mutual Fund Aspect Ratio = 4.23 Aspect Ratio = Power Spectrum [Heer and Agrawala, 2006] 16

17 Expanding the Study Cleveland et al. did not study the entire space of slope comparisons and 45 degrees was at the low end of their study (blue marks on right) Talbot et al. compared more slopes and found that people do better with smaller slopes Baselines may aid with this Slope ratio (pij) 87% 65% 48% 35% 25% 17% 11% Mid angle (θ m ) [Talbot et al., 2013] 17

18 Heatmaps Data: Two keys, one quantitative attribute Task: Find clusters, outliers, summarize How: area marks in grid, color encoding of quantitative attribute Scalability: number of pixels for area marks (millions), <12 colors Red-green color scales often used - Be aware of colorblindness! Fast-Pitch Softball Slugging Percentage [fastpitchanalytics.com] 18

19 Bertin Matrices Must we only use color? - What other marks might be appropriate? [C.Perrin et al., 2014] 19

20 Bertin Matrices Must we only use color? - What other marks might be appropriate? [C.Perrin et al., 2014] 19

21 Bertin s Encodings Text text Grayscale QUANTITY OF INK ENCODINGS POSITIONAL ENCODING MEAN-BASED ENCODINGS Circle Dual bar chart Bar chart Line Black and white bar chart Average bar chart [C.Perrin et al., 2014] 20

22 Matrix Reordering [Bertin Exhibit (INRIA, Vis 2014), Photo by Robert Kosara] 21

23 Cluster Heatmap [File System Similarity, R. Musăloiu-E., 2009] 22

24 Cluster Heatmap Data & Task: Same as Heatmap How: Area marks but matrix is ordered by cluster hierarchies Scalability: limited by the cluster dendrogram Dendrogram: a visual encoding of tree data with leaves aligned 23

25 Sepal.Length Sepal.Width Petal.Length Petal.Width Iris Data (red=setosa,green=versicolor,blue=virginica) Scatterplot Matrix (SPLOM) Data: Many quantitative attributes Derived Data: names of attributes Task: Find correlations, trends, outliers How: Scatterplots in matrix alignment Scale: attributes: ~12, items: hundreds? Visualizations in a visualization: at high level, marks are themselves visualizations 24 [Wikipedia]

26 Spatial Axis Orientation So far, we have seen the vertical and horizontal axes (a rectilinear layout) used to encode almost everything What other possibilities are there for axes? [Munzner (ill. Maguire), 2014] 25

27 Spatial Axis Orientation So far, we have seen the vertical and horizontal axes (a rectilinear layout) used to encode almost everything What other possibilities are there for axes? - Parallel axes Math Physics Dance Drama Parallel Coordinates [Munzner (ill. Maguire), 2014] 25

28 Spatial Axis Orientation So far, we have seen the vertical and horizontal axes (a rectilinear layout) used to encode almost everything What other possibilities are there for axes? - Parallel axes - Radial axes Math Physics Dance Drama Parallel Coordinates [Munzner (ill. Maguire), 2014] 25

29 Radial Axes

30 Radial Axes Polar Coordinates (angle + position along the line at that angle) What types of encodings are possible for tabular data in polar coordinates?

31 Radial Axes Polar Coordinates (angle + position along the line at that angle) What types of encodings are possible for tabular data in polar coordinates? - Radial bar charts Pie charts - Donut charts

32 Part-of-whole: Relative % comparison? 40M 35M 30M Population 65 Years and Over 45 to 64 Years 25 to 44 Years 18 to 24 Years 14 to 17 Years 5 to 13 Years Under 5 Years 25M 20M 15M 10M 5M 0M CA TX NY FL IL PA OH MI GA NC NJ VA WA AZ MA IN TN MOMD WI MN CO AL SC LA KY OR OK CT IA MS AR KS UT NV NMWV NE ID ME NH HI RI MT DE SD AK ND VT DC WY [Stacked Bar Chart, Bostock, 2017] 27

33 Normalized Stacked Bar Chart 100% 90% 65 Years and Over 80% 70% 45 to 64 Years 60% 50% 40% 25 to 44 Years 30% 18 to 24 Years 20% 14 to 17 Years 10% 5 to 13 Years 0% UT TX ID AZ NV GA AK MSNM NE CA OK SD CO KS WYNC AR LA IN IL MN DE HI SCMO VA IA TN KY AL WAMDND OH WI OR NJ MT MI FL NY DC CT PA MAWV RI NH ME VT Under 5 Years [Normalized Stacked Bar Chart, Bostock, 2017] 28

34 Pie Chart 65 < [Pie Chart, Bostock, 2017] 29

35 Pie Charts vs. bar charts [Munzner's Textbook, 2014] - Angle channel is lower precision then position in bar charts What about donut charts? Are we judging angle, or are we judging area, or arc length? - "Arcs, Angles, or Areas: Individual Data Encodings in Pie and Donut Charts", D. Skau and R. Kosara, "Judgment Error in Pie Chart Variations", R. Kosara and D. Skau, Summary: "An Illustrated Study of the Pie Chart Study Results" 30

36 Study Setup Three studies participants each Each answered ~60 questions Computed results using 95% Confidence Intervals 95% CI Mean [R. Kosara and D. Skau, 2016] 31

37 Arcs, Angles, or Areas? [R. Kosara and D. Skau, 2016] 32

38 Signed Error [R. Kosara and D. Skau, 2016] 33

39 Absolute Error [R. Kosara and D. Skau, 2016] 34

40 Absolute Error Relative to Pie Chart [R. Kosara and D. Skau, 2016] 35

41 Donut Charts Width [R. Kosara and D. Skau, 2016] 36

42 Pie Chart Variations [R. Kosara and D. Skau, 2016] 37

43 Pie Chart Variations [R. Kosara and D. Skau, 2016] 38

44 Conclusion: We do not read pie charts by angle [R. Kosara and D. Skau, 2016] 39

45 Pies vs. Bars but area is still harder to judge than position Screens are usually not round 40

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