15	ExploRing Persistence in Financial Time Series
15.1	Introduction
15.2	Hurst and Fractional Integration
15.2.1	Hurst Constant
15.2.2	Fractional Integration
15.3	Tests for I(0) against fractional alternatives
15.4	Semiparametric estimation of difference parameter d
15.5	ExploRing the Data
15.6	The Data
15.7	The Quantlets
15.8	The Results
15.9	Practical Considerations
15.10	Conclusion
	Bibliography