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Topic: Geometric Construction of Standard Deviation
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Pat Ballew

Posts: 74
Registered: 12/3/04
Geometric Construction of Standard Deviation
Posted: Sep 18, 2008 3:36 PM
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A few days ago I came across a patent for a machine that would calculate the standard deviation of a group of numbers from the pre-computer days. It lead me to think that there must be a geometric construction to do the same thing, so I created one (using only three numbers) but it is totally generalizable to more... Lots of images so I put it on a blog at

There is even a pretty good cartoon that an associate sent me..

Pat Ballew,
Lakenheath UK
Elk Rapids, Michigan, USA

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