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Message-ID: <771925$chdf2n@ironport10.mayo.edu>
Date: 2019-10-07T13:00:01Z
From: Terry Therneau
Subject: error in [.terms

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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