I am doing a Net Reclassification Index (NRI) analysis to compare two Cox PH models. I found a SAS NRI macro from https://ncook.bwh.harvard.edu/assets/survmacs.v4.sas. I used SURV_CONTNRI of these macros. However, my SAS code did not work. The code was attached. Could you help me figure it out? Many thanks! ... View more

I'd generate the cumulative incidence rate at several specific time points by using proc lifetest. Code was shown below. However, I still get the cumulative incident rate at continuous time points. Could you help me figure it out?   proc lifetest data=data intervals=0 to 12 by 1 method = lt; time Month*death(0)/EVENTCODE=1; strata group; run; ... View more

I am not sure if proc phreg would count any observations with follow-up time = 0. Shall I change the follow-up time = end date - start date + 1 (Not follow-up time= end date - start date) so that even the start and end date are the same, the follow up time is 1 instead of 0.     ... View more

I used function put to convert a variable from num to char and then save the data as csv. However, when I import the saved csv data I found this variable became back to numeric again. I wonder how to keep the variable as char in the csv data? ... View more

I tried to run the code to add one month to X='01Jan2021'd. First, I am not sure if I need to add inputc for X Second, the code cannot work %let X='01Jan2021'd; %let Xnew = %sysfunc(INTNX('day',%sysfunc(inputc(&X,date9.)),31) date9.); %put &X_new; Howover, I got the error message WARNING: Argument 2 to function INPUTC referenced by the %SYSFUNC or %QSYSFUNC macro function is out of range. ERROR: Expected close parenthesis after macro function invocation not found. 3 %put &X_new; WARNING: Apparent symbolic reference X_NEW not resolved. &X_new   ... View more