KMsurv (version 0.1-2)

lifetab: Create cohort life table

Description

Create cohort life table.

Usage

lifetab(tis, ninit, nlost, nevent)

Arguments

tis

a vector of end points of time intervals, whose length is 1 greater than nlost and nevent.

ninit

the number of subjects initially entering the study.

nlost

a vector of the number of individuals lost follow or withdrawn alive for whatever reason.

nevent

a vector of the number of individuals who experienced the event

Value

• A data.frame with the following columns:
• nsubs
  the number of subject entering the intervals who have not experienced the event.
• nlost
  the number of individuals lost follow or withdrawn alive for whatever reason.
• nrisk
  the estimated number of individuals at risk of experiencing the event.
• nevent
  the number of individuals who experienced the event.
• surv
  the estimated survival function at the start of the intervals.
• pdf
  the estimated probability density function at the midpoint of the intervals.
• hazard
  the estimated hazard rate at the midpoint of the intervals.
• se.surv
  the estimated standard deviation of survival at the beginning of the intervals.
• se.pdf
  the estimated standard deviation of the prbability density function at the midpoint of the intervals.
• se.hazard
  the estimated standard deviation of the hazard function at the midpoint of the intervals

Examples

tis <- c(0, 2, 3, 5, 7, 11, 17, 25, 37, 53, NA)
nsubs <- c(927, 848, 774, 649, 565, 449, 296, 186, 112, 27)
nlost <- c(2, 3, 6, 9, 7, 5, 3, rep(0, 3))
nevent <- c(77, 71, 119, 75, 109, 148, 107, 74, 85, 27)

lifetab(tis, nsubs[1], nlost, nevent)