Performance of the Durbin-Watson Test and WLS Estimation When the Disturbance Term Includes Serial Dependence in Addition to First-Order Autocorrelation
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额外序列依赖下 Durbin–Watson 检验与 WLS 估计的表现AI 解读 ↓
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Monte Carlo simulation is used to study the power of the Durbin-Watson test and the properties of the corresponding weighted least squares (WLS) estimates when there is serial correlation in the disturbance term, in addition to first-order autocorrelation. The results indicate that the Durbin-Watson test detects first-order autocorrelation, even when other forms of serial dependence are also present. However, routine use of WLS estimation when the Durbin-Watson test is significant may result in inaccurate and inefficient parameter estimates. Therefore, this procedure should be used with caution unless there is a priori knowledge concerning the nature of any serial dependence in the disturbance terms.