topic Re: How do I make the HAZARDRATIO statement use the same reference level as the CLASS statement? in Statistical Procedures

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

jahanm — Wed, 20 Feb 2019 19:33:37 GMT

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;

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

SAS_Rob — Wed, 20 Feb 2019 19:53:59 GMT

Try the DIFF=REF option.

hazardratio protons/diff=ref;

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

jahanm — Wed, 20 Feb 2019 20:08:15 GMT

It worked! Thanks.

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

Reeza — Wed, 20 Feb 2019 20:47:57 GMT

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