IVGMM.gradient_momcond()

statsmodels.sandbox.regression.gmm.IVGMM.gradient_momcond

IVGMM.gradient_momcond(params, epsilon=0.0001, centered=True)

gradient of moment conditions

Parameters:	params : ndarray parameter at which the moment conditions are evaluated epsilon : float stepsize for finite difference calculation centered : bool This refers to the finite difference calculation. If centered is true, then the centered finite difference calculation is used. Otherwise the one-sided forward differences are used. TODO: looks like not used yet : missing argument weights