Message-ID: <CABdHhvGYarcJ83fk9D2Dt0Wu1hQCr=1ZowQxy+X8uaET5RH-YQ@mail.gmail.com>
Date: 2013-07-01T21:01:22Z
From: Hadley Wickham
Subject: Problem with anova and the new abbreviation restrictions
In-Reply-To: <51D1EBDF.9050307@mayo.edu>
On Mon, Jul 1, 2013 at 3:51 PM, Terry Therneau <therneau at mayo.edu> wrote:
> An unwanted side effect of the new restrictions on abrreviated names.
>
> The anova.coxph command, in a slavish copy of anova.lm etc, returns a data
> frame with column labels of
> loglik Chisq Df Pr(>|Chi|)
>
> If one tries to extract the final column of the table errors result since it
> is not a standard R variable name.
>
>> afit <- anova(lm(conc ~ uptake, CO2))
>> afit$P
> [1] 2.905607e-06 NA
> Warning message:
> In `$.data.frame`(afit, P) : Name partially matched in data frame
I think it's reasonable to emit a warning in that case, although it
would be more useful to say:
Warning message:
P partially matched to `Pr(>|Chi|)` in data frame
Hadley
--
Chief Scientist, RStudio
http://had.co.nz/