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Box-Cox transformation when best lamba is more than 2

It seems like JMP could only do the best prediction for box-cox transformation when lamba is within 2. In the attached file, the best lamba is 2.6, because after the transformation, skew= -0.04 and kurtosis= -0.06. How could I find that out? Thank you.

P. S. this is a class project.

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