Thanks so much, Richard. I will try this. :)
Semilla
-----Original Message-----
From: Richard Williams [mailto:[email protected]]
Sent: Fri 3/5/2004 9:25 PM
To: [email protected]; [email protected]
Cc:
Subject: Re: st: likelihood ratio test error message
At 09:11 PM 3/5/2004 -0600, Rivera, Semilla M. wrote:
>Hello,
>
>I am attempting to run a lrtest in STATA and get the following error
>message. What can I do?
>
>Thank you.
>Semilla Rivera
>
>. lrtest, using (1)
>
>observations differ: 2098 vs. 2216
>r(498);
I think it probably means that the samples used for your 2 models are not
the same. Perhaps adding some variables caused some cases to drop out? If
so, a possible solution might be something like
logit y x1 x2 x3 x4
estimates store model1
logit y x1 x2 if e(sample)
estimates store model2
That is, run the model with the most missing cases first, and then restrict
the subsequent models to those cases.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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