There was a bug in 2.6.1 which has since been corrected: there is no need
to report corrected bugs in obsolete versions. Two different ways to
compute the sd of a zero-length vector gave different answers.
This is covered by the following NEWS item for 2.7.0 (version from
R-patched)
o co[rv](use = "complete.obs") now always gives an error if there
are no complete cases: they used to give NA if
method = "pearson" but an error for the other two methods.
(Note that this is pretty arbitrary, but zero-length vectors
always give an error so it is at least consistent.)
Since sd(na.rm=TRUE) and var(na.rm=TRUE) both call cov(use =
"complete.obs"), this applies also to them.
On Tue, 29 Jul 2008, Marisa Laetitia wrote:
In the previous versions of R (2.6.1), when a vector of NA was given to the
functions 'sd' or 'var' with parameter na.rm = TRUE, it used to return NA. Now
(2.7.1) it returns an ERROR :
Example in 2.6.1:
sd(c(NA, NA, NA, NA), na.rm = TRUE)
[1] NA
Example in 2.7.1:
sd(c(NA, NA, NA, NA), na.rm = TRUE)
Error in var(x, na.rm = na.rm) : paires d'?l?ments incompl?tes
We are actually wondering if it is a bug to report, or if we have to manage it
in our own R scripts.
Thanks a lot, best regards,
Laetitia
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Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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