Hello,
I have a series of 40 variables that I am trying to transform via the boxcox
method using the powerTransfrom function in R. I have no zero values in any of
my variables. When I run the powerTransform function on the full data set I
get the following warning.
Warning message:
In sqrt(diag(solve(res$hessian))) : NaNs produced
However, when I analyze the variables in groups, rather than all 40 at a time I
do not get this warning message. Why would this be? And does this mean this
warning is safe to ignore?
I would like to add that all of my lambda values are in the -5 to 5 range. I
also get different lambda values when I analyze the variables together versus
in groups. Is this to be expected?
Thank you so much!
Brittany
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