Cox regression analysis when main exposure is a three-level categorical variable

_MooMoo — Mon, 19 Apr 2021 03:32:13 GMT

Hello SAS communities!

I am working with time-to-event data and the main exposure is a three level categorical variable (X is either 0 or 1 or 2). I ran proc phreg and got two hazard ratio estimates which compares 1) 0 vs. 1 2) 0 vs. 2 when I am setting X=0 as reference level. I am wondering if this statistically means the same thing when I subset two data sets, one with X=0 and 1 and another with X=0 and 2. And if I run two separate cox regression, will I get the same estimate?

Any advice is appreciated!

Re: Cox regression analysis when main exposure is a three-level categorical variable

OsoGris — Mon, 19 Apr 2021 12:29:27 GMT

I don't think you will get the same estimates if you split the data. It makes more sense to use one data set for this analysis.

topic Cox regression analysis when main exposure is a three-level categorical variable in Statistical Procedures

Cox regression analysis when main exposure is a three-level categorical variable

Re: Cox regression analysis when main exposure is a three-level categorical variable