Small Area Estimates of Poverty Incidence in the State of Uttar Pradesh in India
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1 Small Area Estimates of Poverty Incidence in the State of Uttar Pradesh in India Hukum Chandra Indian Agricultural Statistics Research Institute, New Delhi Acknowledgments Ray Chambers, University of Wollongong, Australia Nicola Salvati, University of Pisa, Italy
2 Background India has been in an advantageous position with availability of regular data flow through National Sample Survey Office (NSSO) The NSSO surveys, the main source of official statistics in India These surveys are planned to generate statistics at state/national level The estimates are provided (separately for rural and urban sectors) at State/UT and all-india level No regular flow of estimates at further below (e.g., district) level District (or small area) level estimates are currently not available There is a rapidly growing demand of such micro level statistics in India as the country is moving from centralized to more decentralized system 2
3 Examples GOI-UNDP project on Capacity Development for District Planning - It expects decentralised planning to improve effectiveness of development programmes UN-MDG-1: To eradicate extreme poverty and hunger. To monitor the progress and target requires both state and districts level estimates on various parameters, reliable estimates at later level is not available in India NSSO surveys provide reliable state and national level estimates; they cannot be used to derive reliable direct estimates at the district level because of small sample sizes which lead to high levels of sampling variability District is a very important domain of planning process, but we do not have surveys to produce estimates at this level 3
4 There is great emphasis on district level planning in India At the same time it is also true that conducting district specific surveys is going to be very trivial and costly as well as time consuming job Using the state level survey data to derive the estimates at district level may end up with very small sample sizes which may result in very unstable estimates for these levels A need for special techniques to produce estimates for such small domains or small areas referred as small area estimation (SAE) Small area estimation (SAE) answers the problem of small sample sizes 4
5 Map of India 5
6 Uttar Pradesh - state located in northern India Covers 93,933 square miles (243,290 km 2 ), equal to 6.88% of the total area of India The fourth largest Indian state by area Population over 200 million (in 2011) The most populous state in the country as well as the most populous country subdivision in the world 6
7 Application to NSSO Data We use SAE techniques to derive model-based estimates of proportion of poor households at small area levels in the State of Uttar Pradesh in India by linking data from the Household Consumer Expenditure (HCE) Survey of NSSO 63 rd round and the Population Census 2001 Small areas - different districts of State of Uttar Pradesh We illustrate how the HCE survey and Census data can be combined to derive reliable level estimates for various policy relevant parameters The covariates are available at districts level. Therefore, we adopt an area level area model to derive the small area level estimates 7
8 Two types of variables are required for this analysis (i) The variable of interest for which small area estimates are required is drawn from the Household Consumer Expenditure Survey of NSSO 63 rd round data for rural areas of the State of Uttar Pradesh The target variable - poor households The poverty line used to identify whether given household is poor or not The poverty line used is same as those of year , given by planning commission, Govt of India A household having MPCE below the state s poverty line (i.e., Rs ) is categorised as poor household The parameter of interest is the proportion of poor household (HCR) at the district level 8
9 (ii) Covariates known for the population are drawn from the Census 2001 Use of covariates from the Population Census 2001 to model poor household from the HCE Survey of NSSO may raise issues of comparability. However, relationship between variable of interest and covariates used in this study are assumed not to change significantly over the period There were more than 100 covariates available from the Population Census for the purpose of modelling Selection of covariates: We first examined the correlation of all the available covariates with the target variable and then select the covariates with reasonably good correlation with the target variable This was followed by step-wise regression analysis 9
10 Finally, six variables were identified for the further analysis which significantly explained the model. These are (i) sex ratio of SC population, (ii) sex ratio of ST population, (iii) percentage of Other worker Population, (iv) percentage of Literate Male, (v) main Other workers female and (vi) marginal Other population The R 2 for the chosen model was 48 per cent 10
11 Distribution of districts-wise sample size S.No. Sample size S.No. Sample size S.No. Sample size S.No. Sample size Total
12 The sampling design used in the NSSO data is stratified multi-stage random sampling with districts as strata, villages as first stage units and households as the second stage units. A total of 2322 households were surveyed from the 70 districts of the Uttar Pradesh The district-wise sample size varied from 19 to 48 with average of 33 District level sample sizes are very small with average sampling fraction as Difficult to derive reliable estimates and their SE at district level 12
13 Diagnostics for Small Area Estimation Ambler, et al. (2011) Generally two types of diagnostics procedures are tested in small area estimation - Model diagnostics and - Small area estimates validation/diagnostics Suggested criteria for successful SAE SAE model should fit the data and should be able to explain between area variation Model-based estimates should be - consistent with unbiased direct estimates - more precise than direct estimates - more stable over time than direct estimates - acceptable to informed users 13
14 Model diagnostics are used to verify the assumptions of underlying model Small area estimates diagnostics are applied to validate the reliability of the model-based small area estimates 14
15 Bias Diagnostic If direct estimates are unbiased, their regression on the true values should be linear and correspond to the identity line. If model-based estimates are close to the true values the regression of the direct estimates on the model-based estimates should be similar Plot direct estimates on Y-axis and model-based estimates on X- axis - look for divergence of regression line from Y = X. - test for intercept = 0 and slope = 1 15
16 Distribution of the district level residuals (left hand side) and normal q-q plot of the district level residuals (right hand side) If the model assumptions are satisfied then the district level residuals are expected to be randomly distributed and not significantly different from the regression line y=0, where under the GLMM model, the area T level residuals are defined as r ˆ xβ ˆ d d d 16
17 The Figure clearly reveals that the randomly distributed district level residuals and the line of fit does not significantly differ from the line y=0, as expected The q-q plots also confirm the normality assumption Therefore the model diagnostics are fully satisfied for the data 17
18 Diagnostic procedures To validate the reliability of the model-based small area estimates we used the bias diagnostics, coefficient of variation (CV) and computed the 95 percent confidence intervals The bias diagnostics are used to investigate if the model-based estimates are less extreme as compared to the direct survey estimates The bias scatter plot of the model-based estimates against the direct estimates show that the model-based estimates are less extreme as compared to the direct estimates, demonstrating the typical SAE outcome of shrinking more extreme values towards the average 18
19 Bias diagnostics plot Model based estimates 19 Direct estimates
20 Coefficient of variation (CV) assesses the improved precision of the model-based estimates compared to the direct survey estimates The CVs show the sampling variability as a percentage of the estimate Estimates with large CVs are considered unreliable (smaller is better) Plot of CV for direct vs Model based estimates There are no internationally accepted tables available that allow us to judge how large is too large The estimated CVs show that model-based estimates have a higher degree of reliability as compared to the direct estimates 20
21 District-wise CV for direct (solid line) and model-based estimate (dash line) 21
22 95% confidence intervals of direct estimates and model-based estimates 22
23 The standard errors of the direct estimates are too large and therefore the estimates are unreliable Note that for many districts we can even not produce the confidence intervals due to unavailability of standard errors These results show the degree of inequality with respect to distribution of poor households in different districts In many districts the lower bound (Lower) of 95% confidence interval (CI) is negative which results in practically impossible and inadmissible values of CI for direct estimates In contrast, the model estimate with precise CI and reasonable CV percent are reliable 23
24 This problem was mostly observed when there was no variability in the sample data of district (e.g. all y values in sample were 0) The results clearly show the advantage of using SAE technique to cope up the small sample size problem in producing the estimates or reliable confidence intervals These estimates can definitely be useful for resource allocation and policy decision-making relating the living condition of people in rural areas 24
25 Head Count Ratio - Uttar Pradesh
26 26 Poverty Distribution Head Count Ratio - Uttar Pradesh Q Q Q Q Q
27 Q10 Q
28 Q50 Q
29 Q90 Head Count Ratio - Uttar Pradesh
30 Conclusions We demonstrate the application of SAE techniques to estimate the district level statistics of poor households using survey and Census data The diagnostic procedures clearly confirm that the model-based district level estimates have reasonably good precision As the quantum of work involved in the conduct of Census is quite appreciable, Censuses are generally carried out after a fixed period of time - Census data is available only after a certain time period This study produces reliable statistics at micro level using existing surveys and other already available secondary data and can be seen as an initiative example for further applications Such micro level statistics can be generated without conducting micro level specific survey 30
31 This has the merit that unlike Census, estimates can be produced on a regular basis from existing surveys. 31
32 Related References [1] Ambler, R., Caplan, D., Chambers, R., Kovacevic, M. and Wang, S. (2001). Combining unemployment benefits data and LFS data to estimate ILO unemployment for small areas: an application of a modified Fay-Herriot method. Proceedings of the Int. Assoc. of Survey Stat., Meeting of the ISI, Seoul, August [2] Battese, G. E., Harter, R. M. and Fuller, W. A. (1988). An error component model for prediction of county crop areas using survey and satellite data. J. of the Amer. Stat. Assoc. 83, pp [3] Chambers, R. and Tzavidis, N. (2006). M-quantile models for small area estimation. Biometrika, 93, [4] Chandra, H., Salvati, N. and Sud, U.C. (2011a). Disaggregate-level estimates of indebtedness in the state of Uttar Pradesh in India-an application of small area estimation technique. Journal of Applied Statistics, 38(11), pp [5] Chandra, H., Sud, UC. and Gupta V.K. (2013). Small Area Estimation under Area Level Model Using R Software. [6] Chandra, H., Sud, U. C. and Salvati, N. (2011b). Estimation of District Level Poor Households in the State of Uttar Pradesh in India by Combining NSSO Survey and Census Data. Journal of the Indian Society of Agricultural Statistics, 65(1), 1-8. [7] Elbers, C., Lanjouw J. and Lanjouw P., (2003). Micro-level estimation of poverty and inequality, Econometrica, 71,
33 [8] Fay, R. E. and Herriot, R. A. (1979). Estimation of income from small places: an application of james-stein procedures to census data. J. of the Amer. Stat. Assoc. 74, pp [9] Johnson, F.A., Chandra, H., Brown, J. J. and Padmadas, S. (2009). District-level estimates of institutional births in ghana: application of small area estimation technique using census and DHS data, J. of Off. Stat. [10] Manteiga, G.W., Lombardìa, M.J., Molina, I., Morales, D. and Santamarìa, L. (2007). Estimation of the mean squared error of predictors of small area linear parameters under a logistic mixed model. Comput. Stat. & Data Anal. 51(2007), pp [11] Molina, I. and Rao, J.N.K. (2009). Small area estimation of poverty indicators. The Canadian Journal of Statistics. [12] Mukhopadhyay, P.K. and McDowell, A. (2011). Small Area Estimation for Survey Data Analysis Using SAS. Working paper SAS Institute Inc., Cary, NC. [13] Prasad, N. G. and Rao, J. N. K. (1990). The estimation of the mean squared error of small-area estimators,journal of the American Statistical Association, 85, [14] Rao, J.N.K. (2003). Small Area Estimation. Wiley Series in Survey Methodology, John Wiley and Sons Inc, [15] Saei A. and Chambers, R. (2003). Small area estimation under linear and generalized linear mixed models with time and area effects, W.P. No. M03/15(2003), Southampton Statistical Sciences Research Institute, University of Southampton, UK. [16] Tzavidis, N., Salvati, N., Pratesi, M. and Chambers, R. (2008). M-quantile models for poverty mapping. Stat.Meth.and Applications, 17,
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