Dear Dan,
Try this:
with(dummy,tapply(as.numeric(len),as.factor(V1),summary))
See ?with, ?tapply and ?summary for more information.
HTH,
Jorge
On Fri, Mar 27, 2009 at 10:15 PM, Dan Kortschak <
dan.kortsc...@adelaide.edu.au> wrote:
> Hello R users,
>
> I have a data set which is a set of len
Hello R users,
I have a data set which is a set of lengths and types of objects. I want
to calculate the mean length for each type of object as opposed to the
mean of all the objects in the set.
This is in order to make a comparison between the lengths of each type
of objects and the number of th
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