I am using the following procedure. proc phreg data=ag16g covsandwich(aggregate); ID caseidno; model daystorept2*inrept2(0)=cntc30chld /ties=breslow; /*if daystorept2-daystochcntc=. or daystorept2-daystochcntc>30 then cntc30chld=0; else cntc30chld=1; */ if 0<=daystorept2-daystochcntc <= 30 then cntc30chld=1; else cntc30chld=0; run; ... View more

Obs caseidno daystorept2 inrept2 daystochcntc 1 00010003 114 0 88 2 00011404 183 0 . 3 00011405 183 0 . 4 00021203 110 0 . 5 00021204 110 0 . 6 00021205 110 0 . 7 00021206 183 0 . 8 00021207 183 0 . 9 00021208 183 0 . 10 00021208 110 0 . 11 00021403 3 0 . 12 00021403 183 0 . 13 00021404 3 0 . 14 00021404 183 0 . 15 00021405 3 0 . 16 00021405 183 0 . 17 00021503 183 0 . 18 00021503 71 0 . 19 00021504 183 0 . 20 00021504 71 0 . 21 00021505 1 0 . 22 00021505 183 0 . 23 00021505 20 0 . 24 00031303 4 0 . 25 00031303 183 0 . 26 00031403 111 0 . 28 00031403 11 1 . 29 00031403 50 0 . 30 00031403 183 0 . 31 00031503 183 0 . 32 00031504 183 0 . 33 00031505 183 0 . 34 00031505 135 0 . 35 00031506 183 0 . 36 00031506 135 0 . 37 00051103 183 0 . 38 00051104 183 0 . 39 00051105 183 0 . 40 00051204 183 0 174 41 00051204 183 0 178 42 00051204 183 0 180 43 00051204 21 0 17 44 00051204 183 0 182 ... View more

Thank you! Let me prepare that! Thank you for your time and patience! ... View more

it's the gap between "survival time" (days to report) and days to contact date. ... View more

Just checked, they were exactly the same variable. ... View more

you mean, do a cross tab table of the two variables? Let me check that! Thank you so much for your quick response! ... View more

Thank you very much for your help. To be honest, I am not really clear how this relates to my problem. I checked frequencies using two different definitions, and the frequencies were exactly the same. But the results of proc phreg precedure gives conflicting info. I am very confused. Could you explain more? Thank you! ... View more