I have a question regarding
caret::BoxCoxTrans. As you recall this finds the lambda (for highly skewed data) so that a BoxCox transformation can be carried out.
I have a feature/attribute that is highly skewed, skewness = 2.912 and the ratio of maximum value : min value = 208.8. The actual minimum is zero but I found the smallest value that is NOT zero and calculated the ratio. (Correct or not?)
However when I use the
caret::BoxCoxTrans to determine the lambda value I get a message stating,
 0.004016064 0.009803922 0.000000000 0.052083333 0.010677344 0.030769231 Box-Cox Transformation 3500 data points used to estimate Lambda Input data summary: Min. 1st Qu. Median Mean 3rd Qu. Max. 0.000000 0.000000 0.006093 0.008548 0.012821 0.159420 Lambda could not be estimated; no transformation is applied