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Topic: Squares intead Module in standard deviation
Replies: 3   Last Post: Oct 14, 2013 6:54 PM

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Christiano

Posts: 5
Registered: 10/8/13
Squares intead Module in standard deviation
Posted: Oct 12, 2013 12:56 AM
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Why in the formula of standard deviation uses squares instead of simply putting differences within module?

Example:
standard deviation² = Sum[(y-ym)²]/(n-1)

Is not it better this?
standard deviation = Sum[|y-ym|]/(n-1)



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