
I have made a poisson regression by using glm. 
Then I want to check if I have over-dispersion in my model. I tried to use 
glm.diag(fit.1), but then R told me it couldn't find the function glm.diag. 

Does anybody know why? Or is there an other methode to check if there is over-dispersion in my model
 		 	   		  
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