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st: How do I keep the same sample size without deleting cases?


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: How do I keep the same sample size without deleting cases?
Date   Sat, 20 Jun 2009 06:47:34 -0400

<>
Dimitris said

I am a new stata user, so excuse me for my ignorance...I am using panel data and I want to do my descriptive analysis and my exploratory analysis having (of course) the same number of observations. I first rum my prbot model and then I make tables with means using e(sample in my "if" statement and everything goes well. However when I do crostabs (using ta or table) the number of observations is different (higher to be exact). I have observed, while making the means tables, that when I dont include in my descriptives all the variables used in the probit model then the sample size changes. How can I keep the sample size the same without deleting the missings?


sysuse auto
probit foreign rep78 price mpg weight // drops 5 obs due to missings on rep78
g byte want = e(sample)
tab mpg foreign if want
su displacement turn if want

etc.

Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html



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