Visualizing Correlations
Use this applet to see the relationship between the size of a
correlation and how closely the data fit the regression line. (Straight to
applet)
Restriction of Range. A
correlation can look smaller than it ought to if the range of one of the
variables is smaller than it ought to be. This applet will allow
you to see how this operates. (Straight to
applet)
Effects of Extreme Values. A corrleation can look larger than it ought to if there is one extreme value. Use this applete to alter the value of an extreme point and see how it alters the correlation obtained. (Straight to applet)
