Seminar

Testing for the appropriate level of clustering in linear regression models

Economics

Speaker:Prof James G. MacKinnon, Queens University
Website: http://qed.econ.queensu.ca/pub/faculty/mackinnon/
Date: Friday 2 October 2020
Time: 14.00
Location: Online via Microsoft Teams

Further details

We propose two tests for the correct level of clustering in regression models. One test focuses on inference about a single coefficient, and the other on inference about two or more coefficients. We provide both asymptotic and wild bootstrap implementations. The proposed tests work for a null hypothesis of either no clustering or "fine" clustering against alternatives of "coarser" clustering. We also propose a sequential testing procedure to determine the appropriate level of clustering. Simulations suggest that the bootstrap tests perform very well under the null hypothesis and can have excellent power. An empirical example suggests that using the tests leads to sensible inferences.