[R] powerTransform warning message?

[Bert Gunter]

I suggest you consult a local statistician. You are (way) over your
head statistically here, and  statistical matters are off topic on
this list. The brief answer to your question is: you are almost
certainly producing nonsense.

Cheers,
Bert


Bert Gunter

"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
   -- Clifford Stoll


On Thu, Jul 16, 2015 at 4:35 PM, Brittany Demmitt <demmitba at gmail.com> wrote:
> 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
>         [[alternative HTML version deleted]]
>
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