
I am using mixed effect models (library lmer) to evaluate factors that influence the catch rate of hake (set by set) in a fishery. I have some empty cells when I include some of the interactions between the fixed factors (e.g. year:area) and interactions between fixed and random effects (e.g. year:vessel, where vessel is a random effect) . While empty cell were not the problem when all factors were treated as fixed using lm or glm, the estimation failed when I used lme4 and treated some of the factors (the vessel id) as random.
María Eva Góngora
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