Tests for Parameter Instability in Regressions with I(1) Processes

Bruce Hansen ()

Journal of Business & Economic Statistics, 2002, vol. 20, issue 1, 45-59

Abstract: This article derives the large-sample distributions of Lagrange multiplier (LM) tests for parameter instability against several alternatives of interest in the context of cointegrated regression models. The fully modified estimator of Phillips and Hansen is extended to cover general models with stochastic and deterministic trends. The test statistics considered include the SupF test of Quandt, as well as the LM tests of Nyblom and of Nabeya and Tanaka. It is found that the asymptotic distributions depend on the nature of the regressor processes--that is, if the regressors are stochastic or deterministic trends. The distributions are noticeably different from the distributions when the data are weakly dependent. It is also found that the lack of cointegration is a special case of the alternative hypothesis considered (an unstable intercept), so the tests proposed here may also be viewed as a test of the null of cointegration against the alternative of no cointegration. The tests are applied to three data sets--an aggregate consumption function, a present value model of stock prices and dividends, and the term structure of interest rates.

Date: 2002
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Journal Article: Tests for Parameter Instability in Regressions with I(1) Processes (1992)
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