scikits.statsmodels.tools.add_constant

scikits.statsmodels.tools.add_constant(data)

This appends a constant to the design matrix.

It checks to make sure a constant is not already included. If there is at least one column of ones then an array of the original design is returned.

Parameters:

data : array-like

data is the column-ordered design matrix

Returns:

data : array

The original design matrix with a constant (column of ones) as the last column.

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