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st: log likelihood using Stata vs. TDA

From   Shige Song <>
Subject   st: log likelihood using Stata vs. TDA
Date   Mon, 15 Jul 2002 04:48:38 -0700

Dear All,

Is there anyone here who use both Stata and TDA? I did a simple
log-logistic hazard model in both packages, and I had two questions:

1) The two packages give the same point estimatation with opposite
direction (e.g. 3.13 in Stata but -3.13 in TDA), anyone can tell me why?

2) The log-likelihood reported by these two packages are dramatically
different, although I was using the same model on the same data set
(for example, Stata gave me 1350.692 but TDA gave me -15803.2146). Am I
missing anything here?

If anyone is willing to help me,  I can provide further details. Thanks!

Shige Song
Department of Sociology, UCLA

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