近期重要研究成果

Testing Over-Identifying Restrictions without Consistent Estimation of the Asymptotic Covariance Matrix (with Wei-Ming Lee and Chung-Ming Kuan, published in JOURNAL OF ECONOMETRICS in 2014)

作者 李偉銘
管中閔
許育進
摘要 We propose new over-identifying restriction (OIR) tests that are robust to heteroskedasticity and serial correlations of unknown form. The proposed tests do not require consistent estimation of the asymptotic covariance matrix and hence avoid choosing the bandwidth in nonparametric kernel estimation. Instead, they rely on the normalizing matrices that can eliminate the nuisance parameters in the limit. Compared with the conventional OIR test, the proposed tests require only a consistent, but not necessarily optimal, GMM estimator. Our simulations demonstrate that these tests are properly sized and may have power comparable with that of the conventional OIR test.