// SURVIVAL_PERIOD.DO UPDATED 2006-10-08
use colon, clear
keep if stage==1
gen id=_n

/* stset the data with time since diagnosis as the timescale */ 
/* restrict person-time at risk to that within the period window (01jan1994-31dec1995) */
stset exit, enter(time mdy(1,1,1994)) exit(time mdy(12,31,1995)) ///
  origin(dx) f(status==1 2) id(id) scale(365.24)

strs using popmort, br(0(1)10) mergeby(_year sex _age) ///
  by(sex) list(n d w p r cr_e2 se_cp)