Re: positive LogL

From: Bruce Southey <southey_at_UIUC.EDU>
Date: Tue, 28 Nov 2006 10:44:41 -0600

Positive LogLs happen and are expected!

The use of the LogL in GLM's has been previously addressed on this list. One of Arthur's explanations was:

"The LogL value reported by ASReml is for the analysis of the working
variable. As this working variable changes between iterations and especially between models, the LogL values are not comparable - even to confirm convergence of a particular model."


---- Original message ----
>Date: Fri, 24 Nov 2006 15:09:09 -0500
>From: Agus Susanto <asusanto_at_UOGUELPH.CA>
>Subject: positive LogL
>Dear ASReml-ers,/
>/I run the following model for categorical data:
>lsw !POISSON ~ mu grp parity !r animal ide(animal)
>On the output I had positive LogL and a Warning: The LogL value is
>unsuitable for comparing GLM models. Can somebody please help me
>explain the case.
>Agus Susanto
>Department of Animal and Poultry Science
>Centre for Genetic Improvement of Livestock
>University of Guelph, Guelph, Ontario, Canada N1G 2W1
>Rm.128, Phone (519) 824-4120 X-58353
Received on Sun Nov 28 2006 - 10:44:41 EST

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