Simple Best-Fit Line
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Move the points and see how the line fits those points. You can exclude points from the best-fit calculation by unchecking the appropriate boxes.
Contributed by: Abby Brown (March 2011)
Open content licensed under CC BY-NC-SA
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"Simple Best-Fit Line"
http://demonstrations.wolfram.com/SimpleBestFitLine/
Wolfram Demonstrations Project
Published: March 7 2011