Hi all!

I have built a model to predict interactions with turtles and the model includes an offset for effort:

ZIP<-zeroinfl(Sturgeon~fMesh+fSeason+offset(LogEffort),dist="poisson",link="logit",data=data)

I wasn't clear about one aspect of the response to a similar question I recently posted...I apply the predicted model to a new dataset of standard conditions and take the sum to get the total predicted numbers of bycatch:

Prediction<-predict(ZIP,newdata=effort,type="response")
sum(Prediction)

Do I first need to exponentiate before taking the sum as in:

Prediction<-exp(predict(ZIP,newdata=effort,type="response"))
sum(Prediction)

Thanks again in advance!

Cheers,

Laura




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