Dear All,

The "coxph" function in the "survival" package allows multiple frailty 
terms. In all the examples I saw, however, the frailty terms are nested. 
What will happen if I have non-nested (that is, cross-classified) frailties 
in the model? Will the model still work? Do I need to take special cares 
when specifying these models? Thanks!

Shige

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