04-27-2022
kivanvan
Obsidian | Level 7
Member since
01-29-2021
- 13 Posts
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Latest posts by kivanvan
Subject Views Posted 1090 03-01-2022 11:07 AM 1818 01-24-2022 09:38 AM 1823 01-24-2022 09:05 AM 1907 01-21-2022 04:28 PM 1405 11-15-2021 08:35 AM 1433 11-12-2021 10:06 AM 1497 11-10-2021 02:54 PM 3750 07-01-2021 08:15 PM 3779 07-01-2021 04:07 PM 3780 07-01-2021 04:02 PM -
Activity Feed for kivanvan
- Posted How to assess PH assumption in extended Cox model? on Statistical Procedures. 03-01-2022 11:07 AM
- Posted Re: PROC MIXED LSMEANS by predictor without interaction term in MODEL on Statistical Procedures. 01-24-2022 09:38 AM
- Posted Re: PROC MIXED LSMEANS by predictor without interaction term in MODEL on Statistical Procedures. 01-24-2022 09:05 AM
- Posted PROC MIXED LSMEANS by predictor without interaction term in MODEL on Statistical Procedures. 01-21-2022 04:28 PM
- Posted Re: Level 2 residuals and predicted value in PROC MIXED for repeated measures on Statistical Procedures. 11-15-2021 08:35 AM
- Liked Re: Level 2 residuals and predicted value in PROC MIXED for repeated measures for StatsMan. 11-15-2021 08:34 AM
- Liked Re: Level 2 residuals and predicted value in PROC MIXED for repeated measures for StatsMan. 11-12-2021 10:07 AM
- Posted Re: Level 2 residuals and predicted value in PROC MIXED for repeated measures on Statistical Procedures. 11-12-2021 10:06 AM
- Posted Level 2 residuals and predicted value in PROC MIXED for repeated measures on Statistical Procedures. 11-10-2021 02:54 PM
- Posted Re: Convergence issue in PROC MIXED with REPEATED statement on Statistical Procedures. 07-01-2021 08:15 PM
- Liked Re: Convergence issue in PROC MIXED with REPEATED statement for jiltao. 07-01-2021 08:15 PM
- Posted Re: Convergence issue in PROC MIXED with REPEATED statement on Statistical Procedures. 07-01-2021 04:07 PM
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- Posted Re: Convergence issue in PROC MIXED with REPEATED statement on Statistical Procedures. 07-01-2021 04:02 PM
- Posted Convergence issue in PROC MIXED with REPEATED statement on Statistical Procedures. 06-30-2021 01:01 PM
- Posted Re: How to line up visit numbers on SAS Procedures. 01-29-2021 01:57 PM
- Posted How to line up visit numbers on SAS Procedures. 01-29-2021 11:39 AM
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Posts I Liked
Subject Likes Author Latest Post 1 1 1 1 2
03-01-2022
11:07 AM
In my PH Cox model (using PROC PHREG), one of my continuous covariate (EGFR) violates the PH assumption. Based on the plot of Schoenfeld residual below, I decide to use a heaviside function with the time cut-off at 2 (the 600th rank of time) on this variable.
I believe that, with the heaviside function, I still assume the proportional hazard in each time interval. I tried the ZPH option and ASSESS statement, and I got the note: "Model assessment is not available when there are time-dependent covariates. The ASSESS statement is ignored." I further tried to output Schoenfeld residual (see code below), but I got no observation in the output dataset. Does anyone know how to assess the PH assumption in this model?
PROC PHREG DATA= DF;
CLASS EXPO SEX;
MODEL TIME*SA(0,)= EXPO AGE SEX EGFRT1 EGFRT2 / RL=PL;
EGFRT1=0;
IF TIME<2 THEN EGFRT1=EGFR;
EGFRT2=0;
IF TIME>=2 THEN EGFRT2=EGFR;
OUTPUT OUT=SCHOEN RESSCH=SCHEXPO SCHAGE SCHSEX SCHEGFRT1 SCHEGFRT2;
RUN;
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01-24-2022
09:38 AM
Thank you for your help! The E option works great for me.
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11-15-2021
08:35 AM
I see. Thank you!
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07-01-2021
08:15 PM
That's exactly the message I got. Thanks a lot!
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