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...random=NULL, > family="zapoisson",data=Trucha) Error in MCMCglmm(Abundancia ~ BA + CI, random = NULL, family = "zapoisson", : please use idh(trait):units or us(trait):units or trait:units for error structures involving multinomial data with more than 2 categories or zero-infalted/altered/hurdle models I don't know where is the problem, maybe because my original data is organised as (obviously with much more data): Abundance BA CI 5 1 1 3 2 1 6 1 2 Any idea or suggestion? Many thanks for your help and patience, best regards Pablo...

...del1 <-MCMCglmm(fixed = NoRRVpos ~ Year, random = ~County, family="zipoisson", data=Rabies_Project_Init)Error in MCMCglmm(fixed = NoRRVpos ~ Year, random = ~County, family = "zipoisson", : For error structures involving multinomial data with more than 2 categories, or zero-infalted/altered/hurdle modelsIn addition: Warning message:Unknown or uninitialised column: 'family'. Thanks Bert [[alternative HTML version deleted]]