Constrained Maximum Likelihood (CML), developed at Aptech Systems, generates maximum likelihood estimates with general parametric constraints (linear or nonlinear, equality or inequality), using the sequential quadratic programming method. CML computes two classes of confidence intervals by...

An algorithm is developed for solving nonlinear dynamic models in which one of the control variables is discrete. This structure is particularly relevant to economic models with fixed costs. The methodology is a generalization of discrete state space Euler equation methods for solving dynamic...

This paper introduces CodEc, an Internet repository for computer programs written by, and for, economists and econometricians. CodEc provides a means to aid communication among researchers by using the Internet to share implementations of algorithms. After a description of the current content of...

Nonlinear estimation problems have a unknown number of stationary points. Interval arithmetic is a promising method that eliminates all but the global optimum. Automatic differentiation provides users with a convenient method of computing the gradient and Hessian of nonlinear functions these two...

Monte Carlo experiments establish that the usual 't-statistic' used for testing for first-order dial correlation with artificial regressions is far from being distributed as a Student's t in small samples. Rather, it is badly biased in both mean and variance and results in grossly misleading...

This paper presents analytical gradients for a broad class of regime-switching models with Markovian state-transition probabilities. Such models are usually estimated by maximum likelihood methods, which require the derivatives of the likelihood function with respect to the parameter vector....

The first goal of this paper is to clarify the implications of the no arbitrage assumption in the context of several countries and extend to a general setting of continuous-time finance and stochastic interest rates results which were more or less present in classical finance models such as the...