estimate parameters using GMM
start : array_like
starting values for minimization
weights : array
weighting matrix for moment conditions. If weights is None, then the identity matrix is used
paramest : array
estimated parameters
Notes
todo: add fixed parameter option, not here ???
uses scipy.optimize.fmin
statsmodels.sandbox.regression.gmm.NonlinearIVGMM.fit
statsmodels.sandbox.regression.gmm.NonlinearIVGMM.fititer
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