[Rd] [.terms issue

Therneau, Terry M., Ph.D. therne@u @end|ng |rom m@yo@edu
Fri Apr 5 15:44:56 CEST 2019

As  footnote, the error in survival:::untangle.specials is that it assumed that if 
attr(myterms, 'specials')[['strata']] was = to 4, then one could use myterms[-4] to remove 
the strata term.   Not so.   In the model  y ~  x1 + x2 + strata(x3)  the attritube will 
be 4 -- the response counts --- but to remove it I need to use [-3] since the response 
does not count in [.terms or drop.terms.

Is this an inconsistency that should be documented and/or repaired?   What would break if 
we did?    I don't know.  By chance, all the usages in the survival package happened after 
a call to delete.response so it would be immune to such a change.

Terry T.

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