how to test the heterogeneity on the cumulative hazards of multiple trts for recurrent events?I wo

[SeaMoon_168]

I used the following SAS code to generate cumulative incidence functions (CIF). However, I'd like to know how to test the heterogeneity on the cumulative hazards of these multiple trts for recurrent events. Now my plan is to use some specific tests (i.e.,Mann-Kendall test ) to compare the generated CIFs of these trts. Or I can directly use the p-value of the HR of the phreg model to compare these groups? Any advice? Thanks.

title2 'PWP Total Time Model with Common Effects';
proc phreg data=Bladder2;
   model (tstart,tstop) * status(0) = Trt Number Size;
   strata Visit;
run;

Original code can be access from

https://documentation.sas.com/doc/en/statug/15.2/statug_phreg_examples10.htm 

[Ksharp]

1) You can use PROC LIFETEST to do Gray Test.

proc lifetest data=sashelp.bmt plots=cif(test ) notable ;
time t*status(0)/eventcode=1;
strata group/order=internal;
run;

2) Or did you try to do "Assessing the proportional hazards assumption"? Check this at bottom of paper.

https://stats.oarc.ucla.edu/sas/seminars/sas-survival/

7. Assessing the proportional hazards assumption