# Updating ipod to 2 1

1. This gradient is used to compute the asymptotic covariance matrix of \hat and to obtain the analytical gradient of the objective function if the method is set to "CG" or "BFGS" in optim and if "type" is not set to "cue"" So obviously R solves this numerically if I don't provide it!? Say the moments you are using are of the form $\operatorname[g(x_t,\theta)]=0$, where $\theta$ are the parameters you're estimating.