Integral approximation of a time dependent function.

Computes an approximation of \(\int_start^stop S(t) dt\), where \(S(t)\) is a survival function, for a selection of start and stop time points.

Usage

int_surv(times, surv, start = 0, stop = max(times), extend = FALSE)

Arguments

times

Numeric vector, sorted time points.

surv

Numeric vector, values of a survival function evaluated at time points given by times.

start

Numeric vector, start of the integral.

stop

Numeric vector, end of the integral.

extend

should the integral be extended beyond the last observed time point

Value

Numeric vector, value of the integral.

Author

Andreas Nordland