Noah Effect

Definition:

The tendency of persistent time series (0.50<H<1.00) to have abrupt, and discontinuous changes. The normal distribution assumes continuous changes in a system. However, a time series which exhibits Hurst statistics may abruptly change levels, skipping values either up or down. Mandelbrot coined the term "Noah effect" after the biblical story of the deluge. See: Joseph Effect, Hurst Exponent, Persistence, Anti-persistence.

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Copyright © 2011 Campbell R. Harvey, Professor of Finance, Fuqua School of Business at Duke University

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Realized volatility

Sometimes referred to as the historical volatility, this term usually used in the context of derivatives. While the implied volatility refers to the market's assessment of future volatility, the... Read More

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