search for: lower59

Displaying 1 result from an estimated 1 matches for "lower59".

2003 Feb 27
2
interval-censored data in survreg()
...plnorm(0)==0 and pnorm(-Inf)==0 are well defined. Below is a short example to reproduce the problem. Does anyone know why survreg() must behave that way? Is there an alternate solution to this problem? Sincerely, Jerome Asselin library(survival) data(ovarian) newovarian <- ovarian newovarian$lower59 <- newovarian$futime-59 newovarian$time59 <- Surv(newovarian$lower59,newovarian$futime, event=rep(3,nrow(newovarian)),type="interval") survreg(time59~ecog.ps+rx,data=newovarian,dist="lognormal") #THIS DOES NOT WORK BECAUSE ONE OF THE LOWER BOUNDS IS ZERO #Error in surv...