Class statement reference

[wajmsu]

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

[Reeza · Accepted solution]

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

[Rick_SAS]

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