The R Project SVN R-packages

#
# Fit models to the Colon cancer data used in Lin
#
fitc1 <- coxph(Surv(time, status) ~ rx + extent + node4 + cluster(id)
            + strata(etype), colon)
fitc1

fitc2 <- coxph(Surv(time, status) ~ rx + extent + node4 + 
           frailty(id, dist='gauss', trace=T)
            + strata(etype), colon)
fitc2

fitc3 <- coxph(Surv(time, status) ~ rx + extent + node4 + frailty(id, trace=T)
            + strata(etype), colon)
fitc3

fitc4 <- coxph(Surv(time, status) ~ rx + extent + node4 + frailty(id, df=30)
            + strata(etype), colon)
fitc4

# Do a fit, removing the no-event people
temp <- tapply(colon$status, colon$id, sum)
keep <- !(is.na(match(colon$id, names(temp[temp>0])))) 
fitc5 <- coxph(Surv(time, status) ~ rx + extent + node4 +cluster(id)
           + strata(etype), colon, subset=keep)

#
# Do the factor fit, but first remove the no-event people
#
#  Ha!  This routine has a factor with 506 levels.  It uses all available
#    memory, and can't finish in my patience window.  Commented out.

#fitc4 <- coxph(Surv(time, status) ~ rx + extent + node4 + factor(id), colon,
#          subset=keep)