A Test for Functional Form Against Nonparametric Alternatives

Jeffrey Wooldridge

Econometric Theory, 1992, vol. 8, issue 4, 452-475

Abstract: A test for neglected nonlinearities in regression models is proposed. The test is of the Davidson-MacKinnon type against an increasingly rich set of non-nested alternatives, and is based on sieve estimation of the alternative model. For the case of a linear parametric model, the test statistic is shown to be asymptotically standard normal under the null, while rejecting with probability going to one if the linear model is misspecified. A small simulation study suggests that the test has adequate finite sample properties, but one must guard against over fitting the nonparametric alternative.

Date: 1992
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