Jiang, Zhi-Qiang; Xie, Wen-Jie; Zhou, Wei-Xing - In: Physica A: Statistical Mechanics and its Applications 405 (2014) C, pp. 235-244
The weak-form efficiency of energy futures markets has long been studied and empirical evidence suggests controversial conclusions. In this work, nonparametric methods are adopted to estimate the Hurst indexes of the WTI crude oil futures prices (1983–2012) and a strict statistical test in the...