Hello, I know I am a little late to this post, but I hope it is still recent enough that you may provide assistance. I am also trying to utilize Genmod graphics for model fit assessment to show negative binomial distribution is a better fit than poisson. I found the same Pedan paper and wanted to create a similar graph. I have been successful doing this without an offset. However, my data requires that an offset be included. In the Pedan paper, they state an offset was used. I was wondering if you had any luck including an offset in your analysis? Fit statistics suggest the negative binomial model fit the data the best, however, when visualized this is not the case. I believe I am estimating the parameters wrong, given that an offset should somehow be incorporated. Can you provide me any help, suggestions, or references? Thanks in advance!
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