Department of Economics
Nashville, TN 37235
Information about this author at RePEc
NBER Working Papers and Publications
|June 2005||A Portmanteau Test for Serially Correlated Errors in Fixed Effects Models|
with Gary Solon: t0310
We propose a portmanteau test for serial correlation of the error term in a fixed effects model. The test is derived as a conditional Lagrange multiplier test, but it also has a straightforward Wald test interpretation. In Monte Carlo experiments, the test displays good size and power properties.
|Two-Sample Instrumental Variables Estimators|
with Gary Solon: t0311
Following an influential article by Angrist and Krueger (1992) on two-sample instrumental variables (TSIV) estimation, numerous empirical researchers have applied a computationally convenient two-sample two-stage least squares (TS2SLS) variant of Angrist and Krueger's estimator. In the two-sample context, unlike the single-sample situation, the IV and 2SLS estimators are numerically distinct. Our comparison of the properties of the two estimators demonstrates that the commonly used TS2SLS estimator is more asymptotically efficient than the TSIV estimator and also is more robust to a practically relevant type of sample stratification.
|November 2000||Long Memory and Regime Switching|
with Francis X. Diebold: t0264
The theoretical and empirical econometric literatures on long memory and regime switching have evolved largely independently, as the phenomena appear distinct. We argue, in contrast, that they are intimately related, and we substantiate our claim in several environments, including a simple mixture model, Engle and Lee's (1999) stochastic permanent break model, and Hamilton's (1989) Markov switching model. In particular, we show analytically that stochastic regime switching is easily confused with long memory, even asymptotically, so long as only a small' amount of regime switching occurs, in a sense that we make precise. A Monte Carlo analysis supports the relevance of the theory and produces additional insights.
Published: Diebold, Francis X. and Atsushi Inoue. "Long Memory And Regime Switching," Journal of Econometrics, 2001, v105(1,Nov), 131-159.