Clarification of PROC PHREG Time and CLASS Usage
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: PHRTIME */
/* TITLE: Clarification of PROC PHREG Time and CLASS Usage */
/* PRODUCT: STAT */
/* SYSTEM: ALL */
/* KEYS: Time Variable, CLASS Variable, Time-Dependent */
/* PROCS: PHREG */
/* DATA: */
/* SUPPORT: sasycs */
/* REF: SAS/STAT User's Guide, PROC PHREG Chapter */
/* MISC: */
/****************************************************************/
data Test;
input T Status A @@;
MirrorT = T;
datalines;
23 1 1 7 0 1
23 1 1 10 1 1
20 0 1 13 0 1
24 1 1 10 1 1
18 1 2 6 1 2
18 0 2 6 1 2
13 0 2 13 1 2
9 0 2 15 1 2
8 1 3 6 1 3
12 0 3 4 1 3
11 1 3 8 1 1
6 1 3 7 1 3
7 1 3 12 1 3
9 1 2 15 1 2
3 1 2 14 0 3
6 1 1 13 1 2
;
proc phreg data=Test;
class A;
model T*Status(0)=T*A;
run;
proc phreg data=Test;
class A;
model T*Status(0)=A*MirrorT;
run;
proc phreg data=Test;
class A;
model T*Status(0)=A;
run;
proc phreg data=Test;
class A;
model T*Status(0)=A;
if A=3 then A=2;
run;
proc phreg data=Test;
class A;
model T*Status(0)=A X;
X=T*A;
run;
proc phreg data=Test;
class A;
model T*Status(0)=A X1 X2;
X1= T*(A=1);
X2= T*(A=2);
run;
