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LeastSquares.psi_deriv()

statsmodels.robust.norms.LeastSquares.psi_deriv

LeastSquares.psi_deriv(z) [source]

The derivative of the least squares psi function.

Returns:

psi_deriv : array

ones(z.shape)

Notes

Used to estimate the robust covariance matrix.

Links:

http://statsmodels.sourceforge.net/stable/generated/statsmodels.robust.norms.LeastSquares.psi_deriv.html

doc_statsmodels

2017-01-18 16:11:24

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