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
"`e(complete)'"=="available"
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.
Roger
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
--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
Division of Asthma, Allergy and Lung Biology
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom
Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
or 020 7848 6605 International +44 20 7848 6605
Email: [email protected]
Website: http://phs.kcl.ac.uk/rogernewson/
Opinions expressed are those of the author, not the institution.
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