[R-sig-ME] Theta Value in glmer

Phillip Alday me @end|ng |rom ph||||p@|d@y@com
Tue Aug 3 22:39:27 CEST 2021

Hi Amir,

can you share an anonymized version of your data? Or give a bit more of
a minimal working example (MWE)? Then we can probably provide more and
better help. :)


On 17/07/2021 01:22, Amirhossein.AmirhosseinTalebi using radboudumc.nl wrote:
> Dear all,
> I am trying to fit a negative binomial regression using lme4 package. After several attempts using glmer.nb and having error of convergence, I have switched to glmer function to could set the argument nAGQ=0 and used negative binomial function as the family argument.
> The question here is, as the theta value in negative binomial function I tried to use the theta value that glm.nb of package MASS gave me (157); but based on the vignette of glmer I can use theta=1.75. Could you please clarify that how can I choose the best theta value here and until what extend that can change my results? Or based on what parameter in model output I can understand that I used the best theta value?
> Kind regards,
> Amir
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