I'm a PhD student who is analyzing healthcare claims data - counts and expenditures. Can anyone recommend a SAS book that would help me with coding? I need to do non-linear regression, such as using a Negative Binomial or using a two-part model where you first estimate the probability of having any expenditure (maybe w a logit) and then model the expenditure, given there is any (maybe w a log transformed). It would be great if there was a book that showed the code for various models, including the procedures for model specification (e.g. figuring out what model fits the best).
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