On Nov 30, 2009, at 11:02 AM, Henry Thorogood wrote:
Hi,
I'm doing some work with linear models, and I've scaled my data
using the
scale(dataset) function. This was great at removing the skew, but I
now
can't perform the Box Cox transformation on the data set (using the
boxcox(dataset) function), as the scaling has returned negative
values.
Scaling (at least that using the default approach with that function)
should not "remove" skewness.
So my question is: how can I get the scale function to return a
positive set
of data (so I can use Box-Cox),
You could shift the scaled values to the right.
or how can I get the boxcox function to
handle negative values.
Which boxcox function? And have you looked at all of its available
parameters?
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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