Hi, I'm trying to make multiple poisson regressions with the MLE2 command.
I have used the following expression, but I receive an error message:

poisfit <- mle2(y ~ dpois(exp(b0 + b1*x1 + b2*x2)), start=list(b0=1, b1=1,
b2=1), data=data1)
Error in optim(par = c(1, 1, 1), fn = function (p)  :
  non-finite initial value 'vmmin'

I have changed initial values using coefficient values given by the GLM
standard procedure but it still doesn't work.
Do someone knows where is the problem?

Many thanks in advance,

Elena

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