statsmodels.sandbox.regression.gmm.GMM.fititer

method

GMM.fititer(start, maxiter=2, start_invweights=None, weights_method='cov', wargs=(), optim_method='bfgs', optim_args=None)

iterative estimation with updating of optimal weighting matrix

stopping criteria are maxiter or change in parameter estimate less than self.epsilon_iter, with default 1e-6.

Parameters

startarray

starting value for parameters

maxiterint

maximum number of iterations

start_weightsarray (nmoms, nmoms)

initial weighting matrix; if None, then the identity matrix is used

weights_method{‘cov’, …}

method to use to estimate the optimal weighting matrix, see calc_weightmatrix for details

Returns

paramsarray

estimated parameters

weightsarray

optimal weighting matrix calculated with final parameter estimates