Physical Sciences and Mathematics Commons^™

Testing For Sphericity In A Fixed Effects Panel Data Model (Revised July 2009), Badi H. Baltagi, Qu Feng, Chihwa Kao

Center for Policy Research

This paper proposes a test for sphericity in a fixed effects panel data model. It uses the Random Matrix Theory based approach of Ledoit and Wolf (2002) to test for sphericity of the error terms in a fixed effects panel model with a large number of cross-sectional units and time series observations. Since the errors are unobservable, the residuals from the fixed effects regression are used. The limiting distribution of the proposed test statistic is derived. Additionally, its finite sample properties are examined using Monte Carlo simulations.