Hi,
It is not critical but in case of coxph.null model (~1)
extractAIC function generates
Warning message:
In is.na(fit$coefficients) :
is.na() applied to non-(list or vector) of type 'NULL'
As I understand it happens because of absent coefficients attribute.
Function stats:::extractAIC.coxph
Line edf <- sum(!is.na(fit$coefficients))
I think extra null-checking would be useful here.
Regards,
Andriy
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