Heteroskedasticity-Robust Standard Errors for Fixed Effects Panel Data Regression

James H. Stock and Mark W. Watson

Econometrica, 2008, vol. 76, issue 1, pages 155-174

Abstract: The conventional heteroskedasticity-robust (HR) variance matrix estimator for cross-sectional regression (with or without a degrees-of-freedom adjustment), applied to the fixed-effects estimator for panel data with serially uncorrelated errors, is inconsistent if the number of time periods T is fixed (and greater than 2) as the number of entities n increases. We provide a bias-adjusted HR estimator that is nT-consistent under any sequences (n, T) in which n and/or T increase to infinity. This estimator can be extended to handle serial correlation of fixed order. Copyright The Econometric Society 2008.

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