I tried to use phreg (code shown below) to calculate the Hazard Ratios of these variables and here age was included as a spline.
proc phreg data=test; effect spl_age = spline(age / basis=bspline knotmethod=percentilelist(25 75) ); class sex(ref="0") race(ref="0") Hypertension(ref="0") Diabetes(ref="0") Region(ref="0"); model (start,stop)*Censor(0)= sex race Hypertension Diabetes Region spl_age/ risklimits eventcode=1; id usubjid; run;
The code works but I got a message show below: Hazard ratios that cannot be conveniently calculated or displayed are set to missing in the ParameterEstimates table. Use the HAZARDRAT10 statement to compute the needed hazard ratios. I wonder if anything wrong with the code, especially age was treated as a spline. Many thanks.
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