Testing for Coefficient Constancy in Random Walk Models with Particular Reference to the Initial Value Problem

Stephen Leybourne () and Brendan McCabe

Empirical Economics, 1989, vol. 14, issue 2, 105-12

Abstract: This article is concerned with Locally Best Invariant tests for coefficient stability in a univariate random walk coefficient regression model. In particular, we explore the effects that different assumptions about the initial value of the random walk process have on the form and asymptotic distribution of the resulting test statistics. When this initial value is allowed to be random, it is shown that the test statistics are either exactly the same, or possess the same asymptotic distributions, as when the initial value is fixed.

Date: 1989
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