topic categorical variables in proc logist in Statistical Procedures

categorical variables in proc logist

lmyers2 — Sun, 03 Dec 2017 02:09:08 GMT

Hello,

I'm using SAS 9.4 full edition through a server. I will be running a logistic regression model with a very large data set (2700 observations in smaller group and 50000 observations in larger group). I have several categorical variables and am not sure how you program using the class statement and choosing the reference group for each, since I've only run a logistic regression model with 1 categorical variable. Can you help?

Thanks

Laura

Re: categorical variables in proc logist

stat_sas — Sun, 03 Dec 2017 02:59:09 GMT

Hi,

This can be extended for multiple categorical variables in class statement. Assuming var1 and var2 are two classification variables.

proc logistic data=have;

class var1 (param=ref ref='A') var2 (param=ref ref=first);

model dep_var (event='1')= var1 var2;

run;

Re: categorical variables in proc logist

Reeza — Sun, 03 Dec 2017 16:41:45 GMT

Refer to the second example in the documentation which covers regression with categorical variables.

Make sure to set the PARAM=REF on your model.