On Apr 26, 2012, at 9:29 AM, Neil Davis wrote:
Hi,
I have a data.frame which contains timeseries from several different
locations, which I want to compare against each other for example
calculating RMSE, or normalized mean bias of each location against
the others. An example of this is the cor function where I can put
in a data.frame and get the correlation of each location compared to
the others in the data.frame eg.
cor(data.frame(a=runif(10),b=runif(10),c=runif(10),d=runif(10)))
Is there any generic way of getting this for other functions, such
as the aggregate or lapply functions? I have read their
documentation, but was unclear as to how I might use them to get a
matrix like the cor function. I could do this using a pair of loops,
but was hoping there might be a more general way of creating such a
matrix of any comparison function.
Perhaps you are looking for:
?tapply
--
David Winsemius, MD
West Hartford, CT
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