Poisson GLMM: where is the deviance?
Luciano La Sala <lucianolasala at ...> writes:
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Where "stake" (plots where the number of birds is measured) is as random effect, and "yobs" is the abundance of birds. I need an estimation of slope an intercept for the random term. I specified my model as follows: glmer(yobs~year + (year|stake), data=mibase,family=poisson) and I get the following (it does not calculate the deviance) ? Generalized linear mixed model fit by the Laplace approximation
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Q. What does this error mean and how can I solve it? By the way, if I run the same model but only estimating the intercept of random effects as glmer(yobs~year + (1|stake), data=mibase,family=poisson) it seems to work properly.
You aren't doing anything obviously silly, that I can see. Can we see a str() of your data? I wonder if your 'year' variable got turned into a factor by mistake. How many stakes do you have? If it is fewer than 5-6 you are likely to have numerical problems ... When in doubt plot your data ...