[R-sig-ME] fixing covariances to 0 in MCMCglmm

[Jarrod Hadfield]

Hi Celine,

Sorry, this is still not available. Given that there is no information  
in the data to estimate the covariances you want to set to zero, I  
wonder whether there is anything wrong with just having a fully  
unstructured matrix and then ignoring the covariances? The information  
for those covariances will come solely from the prior, but I would  
expect that the posteriors for those (co)variances that can be  
estimated would remain valid. It may reduce mixing, but would be one  
solution.

Cheers,

Jarrod




Quoting Celine Teplitsky <teplitsky at mnhn.fr> on Wed, 30 Jan 2013  
19:09:57 +0100:

> Dear all,
>
> I would like to run an animal model in MCMCglmm with 3 traits, 2  
> male traits and one female trait, but I do not know how to fix the  
> covariances between sexes for Vpe and Vr to 0. From what I  
> understood from an earlier post by Jarrod, it was not possible 2  
> years ago, but any chance it is now?
> Many thanks in advance for help,
>
> All the best
>
> Celine
>
> -- 
>
> Celine Teplitsky
> Département Ecologie et Gestion de la Biodiversité UMR 7204
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