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Re: st: Re: Generating subsamples according to a binary choice


From   <fukugawa-nobuya@rieti.go.jp>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Generating subsamples according to a binary choice
Date   Sat, 1 Nov 2003 18:54:47 +0900 (JST)

Thank you.
It surely works in case of a simple regression model.
Do you have a good idea to do the same in case of a 2step regression model such as zip(zero inflated poisson) or zinb(zero inflated negative binominal) where I obtain "if invalid r(198);" from Stata7?


 --- statalist@hsphsun2.harvard.edu ---

>--- fukugawa-nobuya@rieti.go.jp wrote:
>> Dear Statalisters,
>> I want to classify the sample into two parts accoding to a
>> dichotomy variable and apply them a same regression model.
>> For instance, I want to divide the sample into the subsample A
>> where a dummy takes one and the subsample B where a dummy takes
>> zero. I do this by generating two new worksheets for subsamples
>> A&B in MS-Excel, and then run a regression twice in Stata7.
>> How do I do these procedures using only Stata instead of generating
>> new worksheets in Excel?
>> Thank you in advance.
>> Nobuya Fukugawa
>
>Is this what you need?
>
>. sysuse auto
>. regress mpg weight if foreign==1
>. regress mpg weight if foreign==0
>
>Friedrich Huebler



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