Software review for semi-parametric shared frailty model

This paper is helpful.

Multilevel mixture model

The multilevel mixture model that Bengt and his group have been working on can be of significant importance to demographers, especially those who are obsessed with the idea of "frailty", like myself. I need to do more reading on this. 

The Frailty Model

This is a very good book: http://www.springer.com/statistics/stats+life+sci/book/978-0-387-72834-6

Unfortunately, the sample programs provided at the web site are limited to the first five chapters and the really fun stuffs such as multifrailty model, multilevel frailty model, correlate frailty model, and joint modeling are not there. This is surprise because none of the stuff is impossible to implement with currently available software.