Ols Bias in a Nonstationary Autoregression
非平稳自回归中的 OLS 偏差AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究单位根自回归过程中的 OLS 有限样本偏差与渐近速度。
非平稳自回归中的 OLS 偏差AI 解读 ↓
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An analytical formula is derived to approximate the finite sample bias of the ordinary least-squares (OLS) estimator of the autoregressive parameter when the underlying process has a unit root. It is found that the bias is expressible in terms of parabolic cylinder functions which are easy to compute. Numerical evaluation of the formula reveals that the approximation is very accurate. The derived formula inspires a heuristic approximation, obtained by leastsquares fitting of the asymptotic bias. More importantly, the formula proves analytically that the bias declines at a rate which is slower than the consistency rate, thus explaining some previous simulation findings. A case where the bias increases with the sample size is also given.