Rank Based Tests for Testing the Constancy of the Regression Coefficients Against Random Walk Alternatives

• Main Authors: Manohar B. Rajarshi, Thekke V. Ramanathan, Chanchala A. Ghadge
• Format: Article
• Language: English
• Published: Wrocław University of Science and Technology 2011-01-01
• Series: Operations Research and Decisions
• Online Access: http://orduser.pwr.wroc.pl/DownloadFile.aspx?aid=1015

A class of approximately locally most powerful type tests based on ranks of residuals is suggested for testing the hypothesis that the regression coefficient is constant in a standard regression model against the alternatives that a random walk process generates the successive regression coefficients. We derive the asymptotic null distribution of such a rank test. This distribution can be described as a generalization of the asymptotic distribution of the Cramer-von Mises test statistic. However, this distribution is quite complex and involves eigen values and eigen functions of a known positive definite kernel, as well as the unknown density function of the error term. It is then natural to apply bootstrap procedures. Extending a result due to Shorack in [25], we have shown that the weighted empirical process of residuals can be bootstrapped, which solves the problem of finding the null distribution of a rank test statistic. A simulation study is reported in order to judge performance of the suggested test statistic and the bootstrap procedure. (original abstract)