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Re: st: Parameters returned by -lincom- after -logistic-

From   Roger Newson <[email protected]>
To   [email protected]
Subject   Re: st: Parameters returned by -lincom- after -logistic-
Date   Mon, 09 May 2005 15:38:48 +0100

I think I have found the answer to this particular sub-query. As stated on Page 9 of -[SVY]-, -lincom- after -svy- commands automatically fails in the case of vector degrees of freedom, which corresponds to


This can be confirmed by looking inside the official Stata 8 file -_svylc.ado-. I for one would be surprised if Stata 9 is any different in this respect. Thanks to Richard Williams for all the pointers so far.


At 14:43 09/05/2005, I wrote:

At 13:30 09/05/2005, Richard wrote:

p. 37 of the Stata 8 svy manual gives returned values and some formulas. e(df_m) and e(df_r) don't quite correspond to the d.f. reported by the F stat but I suspect there is some trivial formula that shows the relationship. I know that, in writing my own program, I had to make sure e(df_r) was available when svy was used, otherwise I got z's instead of t's reported.

I think the -e(df_r)- of Page 37 of -[SVY]- probably applies to the case of scalar degrees of freedom, but not to the case of vector degrees of freedom.


Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
Division of Asthma, Allergy and Lung Biology
King's College London

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