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st: mlogit using pweight

From   "Polloni Stefano" <>
To   <>
Subject   st: mlogit using pweight
Date   Thu, 17 Nov 2011 14:01:19 -0500

Greetings Everyone,
I have a few question regarding the use of pweights in multinomial logistic regressions:
(1) Why are the computed standard errors necessarily robust? 
(2) Why is the log-likelyhood as big as if frequency weights were used i.e as if each observations were dulplicated according to their weight
(3) How does this affect the comparability off the AIC and BIC tests computed with the fitstat command (SPost.ado by Long & Freese).
Thank you for any advice.


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