W3cubDocs

/Statsmodels

statsmodels.robust.norms.LeastSquares.psi

LeastSquares.psi(z) [source]

The psi function for the least squares estimator

The analytic derivative of rho

Parameters: z (array-like) – 1d array
Returns: psi – psi(z) = z
Return type: array

© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3-clause BSD License.
http://www.statsmodels.org/stable/generated/statsmodels.robust.norms.LeastSquares.psi.html