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08-26-2016 12:59 PM

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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08-26-2016 04:24 PM

To get you started see the papers at Lexjansen.com

http://lexjansen.com/search/searchresults.php?q=two%20stage%20model

FYI - This is a good place to start research on any SAS topic

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08-29-2016 09:49 AM

Try using PROC FMM:

Your SAS code should look something like this:

proc fmm data=rowdata;

model response = age income avgexp / dist=binary;

model response = age income avgexp / dist=gamma;

model response = / dist=constant;

run;

The last MODEL statement specifies a constant distribution with all mass at zero for the zero target group.

To understand PROC FMM and finite mixture models take a look at:

- SGF paper: https://support.sas.com/resources/papers/proceedings12/328-2012.pdf
- PROC FMM documentation: http://support.sas.com/documentation/cdl/en/statug/68162/HTML/default/viewer.htm#statug_fmm_syntax09...

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