Can anyone provide or direct me to SAS code for two part models in GLM. I am analyzing cost differences between patients who have experienced a poisoning and those who have not. There are lots of zeroes in the data and it is skewed. From what I've read, the first part of the model would be a logistic regression and the second would be a regression with a gamma distribution and log link. I am especially interested in how to combine the results of the two regressions to develop estimates of cost differences between the two groups.
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