Two related questions on use of frailty terms in survreg and coxph.
1. How do I interpret the values that are stored in a survreg or coxph
object under the heading "frail?" They'd appear to be individual
estimates of log frailties, but their sample variance doesn't appear to
be closely related to the value reported as the variance of the random
effect.
2. I want to run a large number of model estimates in a loop, varying
the length of the data set. The output for both survreg and coxph includes an
estimate of the variance of the random effect, but I don't see (that is,
I'm probably missing it) what this value is actually called, so that I
can store an entire vector of them from a large series of models. Any help?
Thanks.
Gordon
--
Dr. Gordon A. Fox Voice: (813)974-7352 Fax: (813)974-3263
Dept. of Biology ((for US mail:)SCA 110) ((for FedEx etc:)BSF 156)
Univ. of South Florida 4202 E. Fowler Ave.
Tampa, FL 33620, USA http://boojum.cas.usf.edu/index.pl/home
"Trying is the first step towards failure." -- Homer Simpson
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