Re: st: Standard Error in logit

[Roger Newson <roger.newson@kcl.ac.uk>]

At 22:01 17/02/2005, Svend Juul wrote:
> Now that we are here: Does anybody have any idea why -logistic- and other 
> -eform- outputs avoid displaying the baseline constant? I know that I can 
> produce it by -lincom _cons-, but I often need it (dependent on study 
> design), so it would be nice if it were - or at least could be - included.

See my Stata Tip on the -eform- option of -regress- (Newson, 2003), which 
applies equally to -logistic- and can be downloaded from my website from 
within Stata by typing

. net from http://www.kcl-phs.org.uk/rogernewson/papers/

The trick is to define a variable equal to 1 in all observations and then 
to include it in the X-variable list, using the -noconst- and -eform- 
options. A variant of this trick is to define multiple baseline odds for 
multiple groups, using the multiple variables generated by the -generate()- 
option of -tabulate- instead of a single variable equal to 1 in all 
observations.

I hope this helps.

Roger


Newson R. 2003. Stata tip 1: The eform() option of regress. The Stata 
Journal 3(4): 445.



--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
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Tel: 020 7848 6648 International +44 20 7848 6648
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Email: roger.newson@kcl.ac.uk
Website: http://phs.kcl.ac.uk/rogernewson/

Opinions expressed are those of the author, not the institution.

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