[Rd] error in [.terms

Therneau, Terry M., Ph.D. therne@u @end|ng |rom m@yo@edu
Mon Oct 7 15:00:01 CEST 2019

As a footnote, the update.formula function shares one of the flaws I mentioned in the 
earlier post

 > test <-  y ~ x1 + (x2=='abc') + x3
 > update(test, . ~ .-x3)
y ~ x1 + x2 == "abc"

The original formula is valid but the updated one is not.

Terry T.

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