'Is there an R function to fit a GLMM for count data with range 0-15? (Possible right censoring needed?)

We are due to collect some survey data that has a range 0-15 score, potentially skewed, and has a multilevel structure (repeated measures and clustering). I'm anticipating that fitting a linear mixed model in R lmer will be problematic given the outcome distribution.

I am considering whether some sort of right-censored generalized linear mixed model (Poisson) may be a solution but I'm struggling to find something to fit this model.

I think the closest that I can find is the VGAM::vglm with family = cens.poisson but, as far as I can tell, it cannot include multilevel structure?

Does anyone know any R functions that would permit this model? If so, is there an equivalent power calc function or would this be written as a simulation?

r poisson vgam

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'Is there an R function to fit a GLMM for count data with range 0-15? (Possible right censoring needed?)

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