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st: st: Obtaining descriptive Stats on matched samples Pre & Post


From   "Clifton Chow" <clifton_chow@post.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: st: Obtaining descriptive Stats on matched samples Pre & Post
Date   Mon, 11 Apr 2011 01:02:48 -0500

Greetings Stata Users,

I have an unabalanced panel dataset from an identical survey given at 2 interview periods.  There are 30-50 questions given in the survey and for each question, some individuals answered at Tiime 1 but not at Time 2 and vice-versa.  How can I obtain summary statistics on each question that was answered by individuals at both interview periods?  In other words, I need to calculate a Pre and Post mean & variance for each survey item in which there was no missing value for that item pre and post for the ssample? For example, Question 38 had N=72/95 who responded in Time 1 and N=57/95 who responded in Time 2, but some of the 57 who responded in Time 2 did not do so in Time 1.  

Thanks in advance
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