Thanks to Kit Baum, there is now a new version of -lincomest- downloadable
from SSC. In Stata, use the -ssc- command to do this.
-lincomest- is described as below on my website. The new version is
intended as the final Stata 7 version, and fixes a bug, which caused it to
produce the wrong results specifically when invoked after -logistic-. (This
bug was caused by the fact that -lincom- automatically uses the -or- option
specifically when invoked after -logistic-, and this feature of -lincom- is
documented in the small print on Page 271 of the Stata 8 manual under -[R]
lincom-.) The new version can also be invoked after Stata 8 -svy- commands
(if the -complete- option is specified for the -svy- command), and should
also work if invoked after Stata 9 -svy- commands. (If anybody finds that
it doesn't, then please let me know.)
I would like to thank Tim Wade for alerting me to the bug involving
-logistic-, and Richard Williams for a lot of helpful hints about the
invokation of -lincom- after Stata 8 -svy- commands.
Best wishes
Roger
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package lincomest from http://www.kcl-phs.org.uk/rogernewson/stata7
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TITLE
lincomest: Extension to lincom saving the combination as estimation
results
DESCRIPTION/AUTHOR(S)
lincomest is an extended version of lincom, which calculates confidence
intervals and P-values for linear combinations of model coefficients.
lincomest saves the estimate and variance of the linear combination as
estimation results, with the option of saving any existing
estimation results
to be recalled by estimates unhold. The advantage of doing this is
that the
linear combination can be input to parmest or parmby to create a
data set
with one observation, containing a confidence interval and P-value
for the
linear combination. This data set can be concatenated with other
parmest
or parmby output data sets using dsconcat, and the confidence intervals
and/or P-values can then be plotted and/or tabulated.
Author: Roger Newson
Distribution-Date: 09may2005
Stata-Version: 7
INSTALLATION FILES (click here to install)
lincomest.ado
lincomest.hlp
lincomest_p.ado
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(click here to return to the previous screen)
--
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.
