How do I make the HAZARDRATIO statement use the same reference level as the CLASS statement?

[jahanm]

I'm using the competing risk model with PHREG on SAS 9.4 and want to obtain the 95% confidence interval for the hazard ratio of a specific variable. In the CLASS statement I specify the reference level I want, but then when I use the HAZARDRATIO  statement to get the 95% CI, it uses the wrong reference level.  How do I make the HAZARDRATIO  statement use the same reference level as the CLASS statement?

proc phreg data=hcc_nonsbrt;
class protons (ref="No");
model fu_time_local_failure*local_failure_cr(0)=protons / eventcode=1;
hazardratio protons ;
format protons binaryf.;
run;

[SAS_Rob · Accepted solution]

Try the DIFF=REF option.

hazardratio protons/diff=ref;

[jahanm]

It worked! Thanks.

[Reeza]

You likely also want PARAM =REF in your class statement as well, otherwise it uses GLM coding.