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more than one estimation methods for the Hurst exponent are required to
reliably diagnose LTP-like behaviour.
Lastly, for a reliable estimate of trend significance, large samples of high
quality data are very important and results of trend analyses from small samples,
typically of 20 to 30 years long, should be viewed with caution because the
apparent short-term regime changes could be an artifact of the fluctuating
behaviour of the underlying observation generating hydrological mechanism.
Acknowledgements
The authors are thankful to Prof. Madan Kumar Jha of Indian Institute of
Technology Kharagpur and Dr. Deepesh Machiwal of Central Arid Zone
Research Institute, India for their constructive comments and suggestions that
led to an improved chapter.
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