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From | "Aldana Rosso" <ar@rcsyd.se> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | st: Different results for confidence intervals for proportions using "svy: proportion" and "espost svy: tabulate" ?? |
Date | Mon, 9 Sep 2013 14:49:49 +0200 |
Hi, I am running the svy proportion command to obtain the confidence intervals for a proportion. I realized that I obtained different results using the "official commands: svy: propotion" and the user written "estpost svy: tabulate race". Does someone know why? Here is an example with the data obtained in the espost website http://repec.org/bocode/e/estout/hlp_estpost.html#svy_tabulate ************************** *Results with estpost ****************************** webuse nhanes2b, clear svyset psuid [pweight=finalwgt], strata(stratid) estpost svy: tabulate race (running tabulate on estimation sample) Number of strata = 31 Number of obs = 10351 Number of PSUs = 62 Population size = 117157513 Design df = 31 ----------------------- 1=white, | 2=black, | 3=other | proportions ----------+------------ White | .8792 Black | .0955 Other | .0253 | Total | 1 ----------------------- Key: proportions = cell proportions . matrix list e(lb) e(lb)[1,4] White Black Other Total r1 .84078371 .07248092 .01076856 .z . matrix list e(ub) e(ub)[1,4] White Black Other Total r1 .90927575 .12486062 .05846181 .z ************************** *Results with svy ****************************** svy: proportion race (running proportion on estimation sample) Survey: Proportion estimation Number of strata = 31 Number of obs = 10351 Number of PSUs = 62 Population size = 117157513 Design df = 31 -------------------------------------------------------------- | Linearized | Proportion Std. Err. [95% Conf. Interval] -------------+------------------------------------------------ race | White | .8791545 .016689 .845117 .9131919 Black | .0955059 .0127491 .069504 .1215079 Other | .0253396 .0105423 .0038385 .0468408 -------------------------------------------------------------- Aldana Aldana Rosso, MSc, PhD Statistician RC Syd - National centre for health care quality registers, Klinikgatan 22, Skane University Hospital, SE-221 85 Lund, Sweden, Tel. +46 46 17 58 12 ar@rcsyd.se * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/