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Positive log-likelihood value?

To: s-news@lists.biostat.wustl.edu
Subject: Positive log-likelihood value?
From: "Dora C PEARCE" <dpearce@students.ballarat.edu.au>
Date: Sun, 29 Jul 2007 10:45:03 +1000
Reply-to: dpearce@students.ballarat.edu.au
Dear S list,
I have run a spatial linear regression model using a CAR covariance matrix and, 
in addition to obtaining a significant association between the dependent and 
independent variables, get a negative log-likelihood (= -6.176). However, when 
I add a factor and an interaction term as additional explanatory variables, the 
log-likelihood is positive (= 1.794).

Is it OK to have a POSITIVE log-likelihood, or does this mean there is a 
misspecification problem?

Thank you in advance for your advice,
Kind regards,
Dora

Dora Pearce
PhD student
School of Science & Engineering
University of Ballarat
PO Box 663, Ballarat, Victoria, 3353
Email: dpearce@students.ballarat.edu.au
Ph: (03) 5327 9264

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