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Tip revision: f54d5e65d30ecadda3d5b4dd691f9c6f1b85d467 authored by Mai Zhou on 02 May 2012, 00:00:00 UTC
version 0.9-8-2
Tip revision: f54d5e6
MMRtime.R
MMRtime <- function(x, d, age) {
#### estimate Mean/Median Residual lifetime over age. 
temp <- WKM( x=x , d=d )
tivec <- temp$times
pivec <- temp$jump

if( age >= tivec[length(tivec)] ) stop("age too large")
if( age < tivec[1] ) warning("age smaller than first event time")

pivec[ tivec < age ] <- 0
Sage <- sum( pivec )

fenzi <- sum( (tivec - age)*pivec )
MRtime <- fenzi/Sage

Ptheta <- Sage/2
Cprob <- cumsum(pivec)
posi <- sum(Cprob < Ptheta)
theta <- tivec[posi+1]

list(MeanResidual = MRtime, MedianResidual = theta - age)
}
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