High Quality Content by WIKIPEDIA articles! In statistics, the power transform is from family of functions that are applied to create a rank-preserving transformation of data using power functions. This is a useful data (pre)processing technique used to stabilize variance, make the data more normal distribution-like, improve the correlation between variables and for other data stabilization procedures. The Box?Cox transformation, by statisticians George E. P. Box and David Cox, is one particular way of parameterising a power transform that has advantageous properties.