VertexFrame reverse_box_cox

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

Calculate the reverse 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 reverse box-cox transformation for each row in a frame using the given lambda value or default 0.

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

yt = exp(wt); if lambda=0, yt = (lambda * wt + 1)^(1/lambda) ; else