Frame box_cox

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box_cox(self, column_name, lambda_value=0.0, box_cox_column_name=None)

Calculate the box-cox transformation for each row in current frame.

Parameters:

column_name : unicode

Name of column to perform transformation on

lambda_value : float64 (default=0.0)

Lambda power paramater

box_cox_column_name : unicode (default=None)

Name of column used to store the transformation

Calculate the box-cox transformation for each row in a frame using the given lambda value or default 0.0.

The box-cox transformation is computed by the following formula, where yt is a single entry value(row):

wt = log(yt); if lambda=0, wt = (yt^lambda -1)/lambda ; else

where log is the natural log.