# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Semi-Standard Deviation

On Morningstar.com's ETF data report pages: The standard deviation of the ETF's monthly returns over a time period for only those months where returns were below the average return. This measure allows potential investors to understand how much downside volatility the ETF has experienced, versus standard deviation, which examines all volatility--upside and downside. It's widely accepted that investors are more concerned about volatility on the downside in analyzing risk.

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