The following R-code may be used for computing likelihood based confidence intervals for the mean (or expected) residual life.

*Definition of the mean residual life*

The mean residual life (or expected remaining lifetime) of a unit at time *t* is given by:

where *MRL(t)* is the mean residual life at time *t*, *f(·)* the probability density function of the failure times, and *S(·)* the survival function. Continue reading R code for constructing likelihood based confidence intervals for the mean residual life