Joint tests of non-nested models and general error specifications

Abstract

This paper is concerned with joint tests of non-nested models and simultaneous departures from homoskedasticity, serial independence and normality of the disturbance terms. Locally equivalent alternative models are used to construct joint tests since they provide a convenient way to incorporate more than one type of departure from the classical conditions. The joint tests represent a simple asymptotic solution to the “pre-testing” problem in the context of non-nested linear regression models. Our simulation results indicate that the proposed tests have good finite sample properties.

Keywords:

• Locally Equivalent Alternative Models
• Non-Normal Errors
• Non-Spherical Errors
• Pre-Testing Problem
• Simulation Study