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


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: How do I keep the same sample size without deleting cases?
Date   Sat, 20 Jun 2009 13:35:28 +0200

<>

As long as the results of the estimation command have not been overwritten, you can also use -e(sample)- itself...

**********
sysuse auto, clear
probit foreign rep78/*
*/ price mpg weight
tab mpg foreign if e(sample)
su displacement turn/*
*/ if e(sample)
**********


HTH
Martin
_______________________
----- Original Message ----- From: "dimitris souftas" <souftronic@hotmail.com>
To: "statalist correct" <statalist@hsphsun2.harvard.edu>
Sent: Saturday, June 20, 2009 12:37 PM
Subject: st: How do I keep the same sample size without deleting cases?



*****


Hi everybody,

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?

Thank you for your understanding,

                          Dimitris Souftas



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