A ratio bounded between 0 and 1 that does not take on the extremes can be modeled with a beta distribution.


Steve Denham
Associate Director, Biostatistics
MPI Research, Inc.


>________________________________
>From: Celine Teplitsky <teplitsky@mnhn.fr>
>To: r-sig-mixed-models@r-project.org 
>Sent: Thursday, January 23, 2014 5:07 AM
>Subject: [R-sig-ME] distribution for ratios?
>
>
>Dear all,
>
>we are trying to run a meta-analysis on factors affecting heritability 
>in MCMCglmm. As it is a ratio of 2 variances, the values are bounded 
>between one and zero, but can not be interpreted as Success/NbTrials, so 
>we can not use a binomial distribution.
>
>So the trouble we're having is knowing which distribution to use? Should 
>we just use a Gaussian?
>
>Many thanks in advance for your help
>
>Best regards
>
>Celine
>
>-- 
>
>Celine Teplitsky
>Département Ecologie et Gestion de la Biodiversité UMR 7204
>Unité Conservation des Espèces, Restauration et Suivi des Populations
>Case Postale 51
>55 rue Buffon 75005 Paris
>
>Webpage : http://www2.mnhn.fr/cersp/spip.php?rubrique96
>Fax : (33-1)-4079-3835
>Phone: (33-1)-4079-3443
>
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