how to include a categorical classification variable for logistic regression

[233]

Hi,

I'm dealing with a problem of logistic regression and I am confused about including the categorical classification variable in the model.

The variables in the model are R Age S Ed Ex0 Ex1 LF M N NW U1 U2 W X respectively;

I have to fit the logistic regression model of high as a function of all variables using Age through X

and treat S as a categorical classification variable in the model.

Below are my codes

proc logistic data=uscrime;
         class S /param=ref ref=first;
         model high = Age S Ed Ex0 Ex1 LF M N NW U1 U2 W X;
         ods select ModelInfo ParameterEstimates Type3 OddsRatios;
 run;

Am I in the right way or is there any suggestions? Thanks!

[pau13rown]

seems fine. if you're unsure you could always create the indicator variables for S in a data step and then fit these in model and confirm the results correspond etc