کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
996585 | 936307 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The efficiency of the crude oil markets: Evidence from variance ratio tests The efficiency of the crude oil markets: Evidence from variance ratio tests](/preview/png/996585.png)
This study examines the random walk hypothesis for the crude oil markets, using daily data over the period 1982–2008. The weak-form efficient market hypothesis for two crude oil markets (UK Brent and US West Texas Intermediate) is tested with non-parametric variance ratio tests developed by [Wright J.H., 2000. Alternative variance-ratio tests using ranks and signs. Journal of Business and Economic Statistics, 18, 1–9] and [Belaire-Franch J. and Contreras D., 2004. Ranks and signs-based multiple variance ratio tests. Working paper, Department of Economic Analysis, University of Valencia] as well as the wild-bootstrap variance ratio tests suggested by [Kim, J.H., 2006. Wild bootstrapping variance ratio tests. Economics Letters, 92, 38–43]. We find that the Brent crude oil market is weak-form efficiency while the WTI crude oil market seems to be inefficiency on the 1994–2008 sub-period, suggesting that the deregulation have not improved the efficiency on the WTI crude oil market in the sense of making returns less predictable.
Journal: Energy Policy - Volume 37, Issue 11, November 2009, Pages 4267–4272