[R] clogit comparison between Stata and R

[Thomas Lumley]

On Wed, 8 Jul 2009, David Hugh-Jones wrote:

> Hello all
>
> I'm moving back and forth between stata and R at the moment - of course,
> using R whenever possible :-)
>
> I'm running conditional logits on some panel data and I get slightly
> different results and different N in the two programs.

That's probably because you are using method="approximate" in R.

>
> I understand why Stata is dropping the groups with all outcomes the same...
> this is inevitable in a conditional logit, right?

Yes.

> Is R doing the same?

Yes.

 	-thomas