https://communities.sas.com/t5/SAS-Procedures/CLASS-statement-in-PHREG/m-p/74281#M21520 there's no CLASS statement in PROC PHREG, you got to parameterize the categorical variables in the programming statements, <A href="http://support.sas.com/onlinedoc/913/getDoc/en/statug.hlp/phreg_sect12.htm" target="_blank">http://support.sas.com/onlinedoc/913/getDoc/en/statug.hlp/phreg_sect12.htm</A>.<BR /> or you may choose PROC TPHREG. Tue, 17 Feb 2009 14:57:31 GMT deleted_user 2009-02-17T14:57:31Z https://communities.sas.com/t5/SAS-Procedures/CLASS-statement-in-PHREG/m-p/74280#M21519 Hello,<BR /> I am having trouble implementing the CLASS statement for categorical predictors (independent variables) in the PHREG procedure. If you've encountered this problem please share your solution if it has worked. Thanks!<BR /> <BR /> This is an example from the SAS documentation website, although when I pasted this into the enhanced editor the "CLASS" statement remained red. This is the problem.<BR /> <BR /> proc phreg data=VALung;<BR /> class Prior(ref='no') Cell(ref='large') Therapy(ref='standard');<BR /> model Time*Status(0) = Kps Duration Age Cell Prior|Therapy;<BR /> run; Tue, 17 Feb 2009 14:17:31 GMT https://communities.sas.com/t5/SAS-Procedures/CLASS-statement-in-PHREG/m-p/74280#M21519 deleted_user 2009-02-17T14:17:31Z https://communities.sas.com/t5/SAS-Procedures/CLASS-statement-in-PHREG/m-p/74281#M21520 there's no CLASS statement in PROC PHREG, you got to parameterize the categorical variables in the programming statements, <A href="http://support.sas.com/onlinedoc/913/getDoc/en/statug.hlp/phreg_sect12.htm" target="_blank">http://support.sas.com/onlinedoc/913/getDoc/en/statug.hlp/phreg_sect12.htm</A>.<BR /> or you may choose PROC TPHREG. Tue, 17 Feb 2009 14:57:31 GMT https://communities.sas.com/t5/SAS-Procedures/CLASS-statement-in-PHREG/m-p/74281#M21520 deleted_user 2009-02-17T14:57:31Z