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From |
Michael Ingre <Michael.Ingre@ipm.ki.se> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Sat, 1 Nov 2003 19:29:17 +0100 |

You have two options with the if statement in almost all stata commands. Note the comma -,- sign:

command xvar yvars , options , if statement

command xvar yvars if statement , options

Michael

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 FukugawaIs this what you need? . sysuse auto . regress mpg weight if foreign==1 . regress mpg weight if foreign==0 Friedrich Huebler* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: Re: Generating subsamples according to a binary choice***From:*<fukugawa-nobuya@rieti.go.jp>

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