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st: Re: firthlogit

From   "Joseph Coveney" <>
To   <>
Subject   st: Re: firthlogit
Date   Sun, 16 Jan 2011 12:18:08 +0900

Nyasha Tirivayi wrote:

I have a problem of quasi-complete separation in my logit model for
[ropensity score matching. I tried using firthlogit instead and I get
the following error "initial vector: matrix must be dimension 27".

In PSM is it worthwile to correct for separation if it occurs? Since I
am unable to solve this problem, should instead remove the problematic


If you're having a problem with -firthlogit-, you can contact me privately with 
the details at the e-mail address given in the its help file.  It will be 
helpful to provide as much of the code and dataset as you can, so that I can 
reproduce the error and debug the command or improve the help file.

Even if you are eventually successful with -firthlogit-, I don't understand 
how you can hope to achieve balance when there is separation.

Joseph Coveney

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