[R-sig-ME] assumptions of discrete time survival analysis

[shahla ebrahimi]

Dear Professors

 I would greatly appreciate if you could let me know how to test the following assumptions when performing a discrete time survival analysis (using lme4).

 1- linear additivity assumption

 2- proportionality assumption

 3- no observed heterogeneity assumption (LR test)

Thanks in advance.
Best regards,
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