/* Bladder cancer data  */
  /* ID EVENT INTERVAL INTTIME START STOP TX NUM SIZE   */
1 0 1 0 0 0 0 1 1
2 0 1 1 0 1 0 1 3
3 0 1 4 0 4 0 2 1
4 0 1 7 0 7 0 1 1
5 0 1 10 0 10 0 5 1
6 1 1 6 0 6 0 4 1
6 0 2 4 6 10 0 4 1
7 0 1 14 0 14 0 1 1
8 0 1 18 0 18 0 1 1
9 1 1 5 0 5 0 1 3
9 0 2 13 5 18 0 1 3
10 1 1 12 0 12 0 1 1
10 1 2 4 12 16 0 1 1
10 0 3 2 16 18 0 1 1
11 0 1 23 0 23 0 3 3
12 1 1 10 0 10 0 1 3
12 1 2 5 10 15 0 1 3
12 0 3 8 15 23 0 1 3
13 1 1 3 0 3 0 1 1
13 1 2 13 3 16 0 1 1
13 1 3 7 16 23 0 1 1
14 1 1 3 0 3 0 3 1
14 1 2 6 3 9 0 3 1
14 1 3 12 9 21 0 3 1
14 0 4 2 21 23 0 3 1
15 1 1 7 0 7 0 2 3
15 1 2 3 7 10 0 2 3
15 1 3 6 10 16 0 2 3
15 1 4 8 16 24 0 2 3
16 1 1 3 0 3 0 1 1
16 1 2 12 3 15 0 1 1
16 1 3 10 15 25 0 1 1
17 0 1 26 0 26 0 1 2
18 1 1 1 0 1 0 8 1
18 0 2 25 1 26 0 8 1
19 1 1 2 0 2 0 1 4
19 1 2 24 2 26 0 1 4
20 1 1 25 0 25 0 1 2
20 0 2 3 25 28 0 1 2
21 0 1 29 0 29 0 1 4
22 0 1 29 0 29 0 1 2
23 0 1 29 0 29 0 4 1
24 1 1 28 0 28 0 1 6
24 1 2 2 28 30 0 1 6
25 1 1 2 0 2 0 1 5
25 1 2 15 2 17 0 1 5
25 1 3 5 17 22 0 1 5
25 0 4 8 22 30 0 1 5
26 1 1 3 0 3 0 2 1
26 1 2 3 3 6 0 2 1
26 1 3 2 6 8 0 2 1
26 1 4 4 8 12 0 2 1
26 0 5 18 12 30 0 2 1
27 1 1 12 0 12 0 1 3
27 1 2 3 12 15 0 1 3
27 1 3 9 15 24 0 1 3
27 0 4 7 24 31 0 1 3
28 0 1 32 0 32 0 1 2
29 0 1 34 0 34 0 2 1
30 0 1 36 0 36 0 2 1
31 1 1 29 0 29 0 3 1
31 0 2 7 29 36 0 3 1
32 0 1 37 0 37 0 1 2
33 1 1 9 0 9 0 4 1
33 1 2 8 9 17 0 4 1
33 1 3 5 17 22 0 4 1
33 1 4 2 22 24 0 4 1
33 0 5 16 24 40 0 4 1
34 1 1 16 0 16 0 5 1
34 1 2 3 16 19 0 5 1
34 1 3 4 19 23 0 5 1
34 1 4 6 23 29 0 5 1
34 0 5 11 29 40 0 5 1
35 0 1 41 0 41 0 1 2
36 1 1 3 0 3 0 1 1
36 0 2 40 3 43 0 1 1
37 1 1 6 0 6 0 2 6
37 0 2 37 6 43 0 2 6
38 1 1 3 0 3 0 2 1
38 1 2 3 3 6 0 2 1
38 1 3 3 6 9 0 2 1
38 0 4 35 9 44 0 2 1
39 1 1 9 0 9 0 1 1
39 1 2 2 9 11 0 1 1
39 1 3 9 11 20 0 1 1
39 1 4 6 20 26 0 1 1
39 0 5 19 26 45 0 1 1
40 1 1 18 0 18 0 1 1
40 0 2 30 18 48 0 1 1
41 0 1 49 0 49 0 1 3
42 1 1 35 0 35 0 3 1
42 0 2 16 35 51 0 3 1
43 1 1 17 0 17 0 1 7
43 0 2 36 17 53 0 1 7
44 1 1 3 0 3 0 3 1
44 1 2 12 3 15 0 3 1
44 1 3 31 15 46 0 3 1
44 1 4 5 46 51 0 3 1
44 0 5 2 51 53 0 3 1
45 0 1 59 0 59 0 1 1
46 1 1 2 0 2 0 3 2
46 1 2 13 2 15 0 3 2
46 1 3 9 15 24 0 3 2
46 1 4 6 24 30 0 3 2
46 0 5 31 30 61 0 3 2
47 1 1 5 0 5 0 1 3
47 1 2 9 5 14 0 1 3
47 1 3 5 14 19 0 1 3
47 1 4 8 19 27 0 1 3
47 0 5 37 27 64 0 1 3
48 1 1 2 0 2 0 2 3
48 1 2 6 2 8 0 2 3
48 1 3 4 8 12 0 2 3
48 1 4 1 12 13 0 2 3
48 0 5 51 13 64 0 2 3
49 0 1 1 0 1 1 1 3
50 0 1 1 0 1 1 1 1
51 1 1 5 0 5 1 8 1
52 0 1 9 0 9 1 1 2
53 0 1 10 0 10 1 1 1
54 0 1 13 0 13 1 1 1
55 1 1 3 0 3 1 2 6
55 0 2 11 3 14 1 2 6
56 1 1 1 0 1 1 5 3
56 1 2 2 1 3 1 5 3
56 1 3 2 3 5 1 5 3
56 1 4 2 5 7 1 5 3
56 0 5 10 7 17 1 5 3
57 0 1 18 0 18 1 5 1
58 1 1 17 0 17 1 1 3
58 0 2 1 17 18 1 1 3
59 1 1 2 0 2 1 5 1
59 0 2 17 2 19 1 5 1
60 1 1 17 0 17 1 1 1
60 1 2 2 17 19 1 1 1
60 0 3 2 19 21 1 1 1
61 0 1 22 0 22 1 1 1
62 0 1 25 0 25 1 1 3
63 0 1 25 0 25 1 1 5
64 0 1 25 0 25 1 1 1
65 1 1 6 0 6 1 1 1
65 1 2 6 6 12 1 1 1
65 1 3 1 12 13 1 1 1
65 0 4 13 13 26 1 1 1
66 1 1 6 0 6 1 1 1
66 0 2 21 6 27 1 1 1
67 1 1 2 0 2 1 2 1
67 0 2 27 2 29 1 2 1
68 1 1 26 0 26 1 8 3
68 1 2 9 26 35 1 8 3
68 0 3 1 35 36 1 8 3
69 0 1 38 0 38 1 1 1
70 1 1 22 0 22 1 1 1
70 1 2 1 22 23 1 1 1
70 1 3 4 23 27 1 1 1
70 1 4 5 27 32 1 1 1
70 0 5 7 32 39 1 1 1
71 1 1 4 0 4 1 6 1
71 1 2 12 4 16 1 6 1
71 1 3 7 16 23 1 6 1
71 1 4 4 23 27 1 6 1
71 0 5 12 27 39 1 6 1
72 1 1 24 0 24 1 3 1
72 1 2 2 24 26 1 3 1
72 1 3 3 26 29 1 3 1
72 1 4 11 29 40 1 3 1
73 0 1 41 0 41 1 3 2
74 0 1 41 0 41 1 1 1
75 1 1 1 0 1 1 1 1
75 1 2 26 1 27 1 1 1
75 0 3 16 27 43 1 1 1
76 0 1 44 0 44 1 1 1
77 1 1 2 0 2 1 6 1
77 1 2 18 2 20 1 6 1
77 1 3 3 20 23 1 6 1
77 1 4 4 23 27 1 6 1
77 0 5 17 27 44 1 6 1
78 0 1 45 0 45 1 1 2
79 1 1 2 0 2 1 1 4
79 0 2 44 2 46 1 1 4
80 0 1 46 0 46 1 1 4
81 0 1 49 0 49 1 3 3
82 0 1 50 0 50 1 1 1
83 1 1 4 0 4 1 4 1
83 1 2 20 4 24 1 4 1
83 1 3 23 24 47 1 4 1
83 0 4 3 47 50 1 4 1
84 0 1 54 0 54 1 3 4
85 1 1 38 0 38 1 2 1
85 0 2 16 38 54 1 2 1
86 0 1 59 0 59 1 1 3
;
run;



*/UNADJUSTED;
PROC PHREG DATA=BLADDER;
MODEL (START,STOP)*EVENT(0)=TX NUM SIZE;
RUN;
*/ROBUST VARIANCE ESTIMATOR;
PROC PHREG DATA=BLADDER COVS(AGGREGATE) ;
MODEL (START,STOP)*EVENT(0)=TX NUM SIZE;
ID ID;
RUN;
*/ROBUST VARIANCE ESTIMATOR STATIFYING ON INTERVAL - CONDITIONAL 1;
PROC PHREG DATA=BLADDER COVS(AGGREGATE) ;
MODEL (START,STOP)*EVENT(0)=TX NUM SIZE;
ID ID;
STRATA INTERVAL;
RUN;

DATA BLADDER2;
SET BLADDER;
START2=0;
STOP2=INTTIME;
RUN;

*/ROBUST VARIANCE ESTIMATOR STATIFYING ON INTERVAL - CONDITIONAL 2;
PROC PHREG DATA=BLADDER2 COVS(AGGREGATE) ;
MODEL (START2,STOP2)*EVENT(0)=TX NUM SIZE;
ID ID;
STRATA INTERVAL;
RUN;

*/NO ROBUST VARIANCE ESTIMATOR STATIFYING ON INTERVAL - CONDITIONAL 2;
PROC PHREG DATA=BLADDER2 ;
MODEL (START2,STOP2)*EVENT(0)=TX NUM SIZE/RL;
STRATA INT;
RUN;