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List: r-devel
Subject: [Rd] na.action(lmObject) -> NULL instead of lmObject$na.action
From: "William Dunlap" <wdunlap () tibco ! com>
Date: 2010-04-30 22:40:21
Message-ID: 77EB52C6DD32BA4D87471DCD70C8D70002DA5173 () NA-PA-VBE03 ! na ! tibco ! com
[Download RAW message or body]
I think the following three calls to na.action() should
return the same thing, but the last returns NULL.
> d <- data.frame(x=c(1,2,NA,NA,5), y=log(1:5),
row.names=LETTERS[1:5])
> na.action(na.exclude(d))
C D
3 4
attr(,"class")
[1] "exclude"
> na.action(model.frame(y~x, data=d, na.action=na.exclude))
C D
3 4
attr(,"class")
[1] "exclude"
> na.action(fit <- lm(y~x, data=d, na.action=na.exclude))
NULL
lm() returns a list component called "na.action" while
na.exclude() and model.frame() return the same thing as
an attribute called "na.action".
> fit$na.action
C D
3 4
attr(,"class")
[1] "exclude"
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
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