[R-sig-ME] Log-normal MCMCglmm

[Jarrod Hadfield]

Hi Dani,

I'm not sure why logging the response is not equivalent? Is it because  
you wish the residuals to be log normal, but the distribution of other  
random effects to be normal? If so, then MCMCglmm is not able to  
handle this: all random effects, including residuals, must be  
(multivariate) normal on some link scale.

Cheers,

Jarrod




Quoting Daniel Sol <dsolrueda at gmail.com> on Tue, 28 Jul 2015 10:47:29 +0200:

> Hi Jörg,
>
> Thanks a lot for the suggestion. I actually have tried to use a Poisson
> error, but it looks like my data best fit a log-normal distribution.
>
> Best,
>
> Dani
>
> 2015-07-28 10:40 GMT+02:00 Jörg Albrecht <albrechj at staff.uni-marburg.de>:
>
>> Hi Dani,
>>
>> you could try specifying
>>
>> family = "poisson".
>>
>> Best,
>>
>> Jörg
>>
>> —
>> Jörg Albrecht, PhD
>> Postdoctoral researcher
>> Institute of Nature Conservation
>> Polish Academy of Sciences
>> Mickiewicza 33
>> 31-120 Krakow, Poland
>> www.carpathianbear.pl
>> www.globeproject.pl
>> www.iop.krakow.pl
>>
>> Am 25.07.2015 um 11:31 schrieb Daniel Sol <dsolrueda at gmail.com>:
>>
>> Hi everybody,
>>
>> I have trouble finding how to implement a MCMCglmm with log-normal error. I
>> know some people just log-transform the response variable, but this is not
>> the same.
>>
>> Many thanks in advance,
>>
>> Dani
>>
>> --
>> Daniel Sol
>> CREAF (Centre for Ecological Research and Forestry Applications)
>> CSIC (Spanish National Research Council)
>> Bellaterra, Catalonia E-08193, Spain
>> TEL: +34 93-5814678
>> FAX: +34 93-5814151
>> E-MAIL: d.sol at creaf.uab.es
>> Webpage: http://dsolrueda.wix.com/sol-group
>>
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>>
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>>
>>
>>
>
>
> --
> Daniel Sol
> CREAF (Centre for Ecological Research and Forestry Applications)
> CSIC (Spanish National Research Council)
> Bellaterra, Catalonia E-08193, Spain
> TEL: +34 93-5814678
> FAX: +34 93-5814151
> E-MAIL: d.sol at creaf.uab.es
> Webpage: http://dsolrueda.wix.com/sol-group
>
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>
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