statsmodels.robust.norms.AndrewWave.psi_deriv
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AndrewWave.psi_deriv(z)
[source] -
The derivative of Andrew?s wave psi function
Notes
Used to estimate the robust covariance matrix.
AndrewWave.psi_deriv(z)
[source]
The derivative of Andrew?s wave psi function
Used to estimate the robust covariance matrix.
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