The robust criterion function for Ramsay’s Ea.
z : array-like
1d array
array :
rho(z) = a**-2 * (1 - exp(-a*|z|)*(1 + a*|z|))
scikits.statsmodels.robust.norms.RamsayE.psi_deriv
scikits.statsmodels.robust.norms.RamsayE.weights
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