Programming the statistical procedures from SAS

Using offset and weight in proc genmod

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Using offset and weight in proc genmod

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I am using proc genmod with gamma distribution to compare costs across two different cohorts. The sample has variable follow up and also I am using the Inverse probability treatment weighting (IPTW) method. In order to account for variable follow up and apply the weight for IPTW, I am using both offset for log of follow up time and weighting by the inverse probability treatment weight in the same model. Is it ok to use both? When I run the model, I am not getting errors or warnings and the algorithm is converging. So is it fine to use both in the same model? 

I will appreciate suggestions if any. 

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