[R] Question regarding significance of a covariate in a coxme survival model

[C. Peng]

My suggestion for Teresa: 

If compare model 1 and model 2 with model 0 respectively, the (penalized)
likelihood ratio test is valid. 
IF you compare model 2 with model 3, the (penalized) likelihood ratio test
is invalid. You may want to use AIC/SBC to make a subjective decision. 


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