Points P1 through P6 represent data points. A line is drawn through the points and from each data point to the line a square is constructed. Drag the y-intercept and slope of the line so that the sum of the areas of the squares is minimized. That line is the least squares regression line for the data. 

 

 

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This is a prototype of JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright ©1990-1998 by Key Curriculum Press, Inc. All rights reserved. Portions of this work were funded by the National Science Foundation (awards DMI 9561674 & 9623018).

Modified version of a GSP sketch by Bill Finzer, 3/95