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st: RE: constraints in mlogit


From   "Newson, Roger B" <r.newson@imperial.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: constraints in mlogit
Date   Mon, 14 Aug 2006 17:28:26 +0100

Use the -lincom- command of official Stata to get confidence imtervals
and P-values for ratios of odds ratios. To find out about -lincom-, type
whelp lincom
in Stata.

Hope this helps.

Roger 


Roger Newson
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London 
Royal Brompton campus 
Room 33, Emmanuel Kaye Building 
1B Manresa Road
London SW3 6LR
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: r.newson@imperial.ac.uk 
www.imperial.ac.uk/nhli/r.newson/

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

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of stata_user
stata_user
Sent: 14 August 2006 17:13
To: statalist@hsphsun2.harvard.edu
Subject: st: constraints in mlogit

Hi,
It is possible to test if two paramters are statistically equal in a
mlogit?

Let Y a discrete variable with 3 categories y1 y2 y3

X1 continuous
X2 binary

I consider mlogit Y X1 X2

y1 is the reference

I obtain two paramters for each of X1 and X2 for the comparisons y2 vs
y1 
and y3 vs y1

For example for X1:

let b21 be the parameter for the comparison y2 vs y1
let b31 be the parameter for the comparison y3 vs y1

How I can test H0: b21=b31

thanks

S.

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