Dear list,

I am using the hurdle model for modelling the habitat of rare fish species. However I do get an error message when I try to model my data:

> test_new1<-hurdle(GALUMEL~ depth + sal + slope + vrm + lat:long + offset(log(haul_numb)), dist = "negbin", data = datafit_elasmo)

Error in hurdle(GALUMEL ~ depth + sal + slope + vrm + lat:long + offset(log(haul_numb)),  :
  invalid dependent variable, non-integer values

When I do fit the same model with round(my dependent variable) the model works. Sorry for the stupid question but could anyone explain me why? My data are zero inflated (zeros occurring for 78%) and positively skewed.

Thank you very much in advance.
Kind Regards,
Valentina



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