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statsmodels.robust.norms.RamsayE.psi_deriv
statsmodels.robust.norms.RamsayE.psi_deriv
¶
RamsayE.
psi_deriv
(
z
)
[source]
¶
The derivative of Ramsay’s Ea psi function.
Notes
Used to estimate the robust covariance matrix.
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statsmodels.robust.norms.RamsayE.psi_deriv