[R] dropterm and frailty

[Göran Broström]

Is it meaningful to use 'dropterm' (MASS) on a fitted coxph (survival) model
with a frailty term? Trying to do so gives results that do not look
meaningful (to me), so my guess is that the answer to my question is 'No'.

So, what is the recommended way of comparing nested mixed-effects models in
general? 
-- 
 Göran Broström                    tel: +46 90 786 5223
 Department of Statistics          fax: +46 90 786 6614
 Umeå University                   http://www.stat.umu.se/egna/gb/
 SE-90187 Umeå, Sweden             e-mail: gb at stat.umu.se