On 11/17/2013 08:49 AM, SCRIPTHAM wrote:
Hi
My R version is the current version as at 15 Nov 2013.
I have tried to calculate range using tapply() with FUN=range.
tapply() returns two fields, the ID field and a field of two text items one
is the maximum and the other is the minimum.
I take as the difference max - min, does R use a different term for range in
tapply?
I have also tried
aggregate() with Fun=range, with Fun=min and FUN=max
and they also gave problems.
What is the best route to calculate ranges for groups within a data frame.
Hi Scriptham,
It looks like you want to get the difference between the maximum and
minimum values rather than the actual values. Define a function:
range_span<-function(x) return(diff(range(x)))
and use that as the FUN argument.
Jim
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