Nonlinear regression with measurement error is important for estimation fro
m microeconomic data. One approach to identification and estimation is a ca
usal model, in which the unobserved true variable is predicted by observabl
e variables. This paper details the estimation of such a model using simula
ted moments and a flexible disturbance distribution. An estimator of the as
ymptotic variance is given for parametric models. Also, a semiparametric co
nsistency result is given. The value of the estimator is demonstrated in a
Monte Carlo study and an application to estimating Engel Curves.