topic Re: Class statement reference in Statistical Procedures

Class statement reference

wajmsu — Fri, 08 Jul 2016 04:50:05 GMT

Hi,

When multivariable analysis is carried out, multiple variables may utilize class statement at the same time but all would have different categories as reference. How would we use them? Below is a code, please guide me is this correct?

proc logistic data=pe.matchedata_21;
strata group;
class birthsea (ref='1') CMV_ca_2_1 (ref='2') sex (ref='1');
model PEstatus (event='1')= birthsea CMV_ca_2_1 sex;
run;

Thanks

Re: Class statement reference

Reeza — Fri, 08 Jul 2016 05:58:15 GMT

Your code is correct. As mentioned earlier set the parameterization method.

Re: Class statement reference

Rick_SAS — Fri, 08 Jul 2016 12:31:01 GMT

Yes, your code is correct. To read more about the various parameterizations that SAS offers for classification variables, see the following:

Create dummy variables in SAS
Four ways to create a design matrix in SAS
The SAS/STAT documentation on parameterization of effects