# Testing the goodness of fit for a Poisson model [duplicate]

I need help in calculating the goodness of fit for a Poisson model. The online literature on it is quite scarce, so if you have any useful articles and links I would appreciate it very much.

Here is how the table looks like from SPSS. The outcome variable is a count of patents a company has.

model http://img827.imageshack.us/img827/1655/screenshot20130606at124.png