TY - CHAP
T1 - A COMPARATIVE STUDY OF PURE AND PRETEST ESTIMATORS FOR A POSSIBLY MISSPECIFIED TWO-WAY ERROR COMPONENT MODEL
AU - Baltagi, Badi H.
AU - Bresson, Georges
AU - Pirotte, Alain
PY - 2003/12/1
Y1 - 2003/12/1
N2 - In the spirit of White's (1982) paper, this paper examines the consequences of model misspecification using a panel data regression model. Maximum likelihood, random and fixed effects estimators are compared using Monte Carlo experiments under normality of the disturbances but with a possibly misspecified variance-covariance matrix. We show that the correct GLS (ML) procedure is always the best according to MSE performance, but the researcher does not have perfect foresight on the true form of the variance covariance matrix. In this case, we show that a pretest estimator is a viable alternative given that its performance is a close second to correct GLS (ML) whether the true specification is a two-way, a one-way error component model or a pooled regression model. Incorrect GLS, ML or fixed effects estimators may lead to a big loss in MSE.
AB - In the spirit of White's (1982) paper, this paper examines the consequences of model misspecification using a panel data regression model. Maximum likelihood, random and fixed effects estimators are compared using Monte Carlo experiments under normality of the disturbances but with a possibly misspecified variance-covariance matrix. We show that the correct GLS (ML) procedure is always the best according to MSE performance, but the researcher does not have perfect foresight on the true form of the variance covariance matrix. In this case, we show that a pretest estimator is a viable alternative given that its performance is a close second to correct GLS (ML) whether the true specification is a two-way, a one-way error component model or a pooled regression model. Incorrect GLS, ML or fixed effects estimators may lead to a big loss in MSE.
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U2 - 10.1016/S0731-9053(03)17001-6
DO - 10.1016/S0731-9053(03)17001-6
M3 - Chapter
AN - SCOPUS:36148972825
SN - 0762310758
SN - 9780762310753
T3 - Advances in Econometrics
SP - 1
EP - 27
BT - Maximum Likelihood Estimation of Misspecified Models
ER -