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Confidence Intervals for Half-Life Deviations From Purchasing Power Parity

机译:购买力平价导致半衰期偏差的置信区间

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Existing point estimates of half-life deviations from purchasing power parity (PPP), around 3-5 years, suggest that the speed of convergence is extremely slow. This article assesses the degree of uncertainty around these point estimates by using local-to-unity asymptotic theory to construct confidence intervals that are robust to high persistence in small samples. The empirical evidence suggests that the lower bound of the confidence interval is between four and eight quarters for most currencies, which is not inconsistent with traditional price-stickiness explanations. However, the upper bounds are infinity for all currencies, so we cannot provide conclusive evidence in favor of PPP either.
机译:根据购买力平价(PPP)得出的半衰期偏差的现有估计(大约3-5年)表明,收敛速度非常慢。本文通过使用局部到整体渐近理论来构建对小样本中的高持久性具有鲁棒性的置信区间,来评估这些点估计值周围的不确定性程度。经验证据表明,大多数货币的置信区间的下限在四分之八到八分之二之间,这与传统的价格粘性解释并不矛盾。但是,所有货币的上限都是无限的,因此我们也无法提供支持PPP的确凿证据。

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