On 3/30/2009 7:50 AM, Thomas Lumley wrote:
On Mon, 30 Mar 2009 sgianner...@gmail.com wrote:
This report follows the post
http://tolstoy.newcastle.edu.au/R/e6/devel/09/03/0760.html
where it is shown that quantile() and IQR() do not work as documented.
Nothing of the sort is shown! The thread argued that methods for these
functions for ordered factors would be useful.
In fact they do not check for numeric input even if the documentation says =
:
?quantile
x numeric vectors whose sample quantiles are wanted. Missing
values are ignored.
?IQR
x a numeric vector.
The documentation says that you are not allowed to pass anything except a
numeric vector to quantile() and IQR(). It doesn't, for example, say you can
pass an arbitrary vector that will be checked to see if it is numeric. If you
have code that passes a factor to IQR(), the bug is in that code.
On the other hand, as someone else has since reported, the 'missing values are
ignored' statement in ?quantile is wrong (or at least incomplete).
I think that statement was wrong, and I fixed it last night, but then
didn't get it committed. The commit will make it into 2.9 and R-devel
today.
Duncan Murdoch
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