[R-sig-ME] covariances between non normal traits

[i white]

Celine,

We can estimate (tetrachoric) correlations between two binomial traits, 
by assuming probits have bivariate normal distribution. I don't know 
whether this fits into GLMM framework.

Celine Teplitsky wrote:
> Dear all,
> 
> I have seen this post by Arthur Gilmour in an ASReml related forum:
>> GLMM models have only been developed for the case of a single GLMM 
>> trait. It is difficult to conceive what is the appropriate error 
>> structure for bivariate GLMM traits when the variances are defined as 
>> functions of the mean. 
> 
> I would like to know what people on this list think about these issues 
> e.g. if we want to estimate correlations between 2 traits with a poisson 
> distribution, are there some special issues to take into account?
> 
> Thanks a lot in advance for your help,
> 
> All the best
> 
> Celine
> 
> 
> 
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