Bollinger Bands

Definition:

Plus or minus two standard deviations where the standard deviations are calculated historically in a moving window estimation. Hence, the bands will widen if the most recent data is more volatile. If the prices break out of the band, this is considered a significant move.

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

Term of the Day

Combination strategy

A strategy in which a put and call with different strike prices and the same expiration are either both bought or both sold. Related: Straddle

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