The following R-code may be used for computing likelihood based confidence intervals for the median residual life.

**Definition of the median residual life**

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

where *mdrl* is the median residual life, and *S(ยท)* the survival function of the failure times.

**Computing likelihood based intervals for M****D*** RL*The method for computing the likelihood based confidence interval for the median residual life is similar to the one I previously used for the mean residual life (this blog post explains the method for computing the likelihood based confidence intervals for the mean residual life).