Linear Regression,
a geogebra
animation
There are 5 points graphed below, together with the regression line that is the best linear fit to the 5 points. The coordinates of point E can be changed. To change the x-coordinate, click and drag the point on the green horizontal bar. To change the y-coordinate, click and drag the point on the green vertical bar. Note that the
regression line and the values for
R and R2 change. R is the correlation coefficient, and R2 is the coefficient of determination.
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As the point E moves further from the regression line, what happens to
R and R2?
For which coordinates of E would you have the most confidence in the regression line as a predictor? |
| G. Battaly, WCC, Created with GeoGebra |
©G. Battaly, 2010 |
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