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Unformatted text preview: independent variable X then you calculate the r 2 or the Coefficient of Determination which tells you the % of reduced uncertainty in prediction if you use the regression equation/model that you developed. Note that this is the covariation of xy SQUARED! And that the variations in the denominator are not squared. If you use the standard deviation in the denominators, then you would square them. Also, if you calculate r 2 first and then calculate r by taking the square root, be sure to go back to see if you have a negative covariance and if so then your r should be negative as well. If you use the following table, it will help you calculate all the things you need for all of the above formulas. Calculation table should include: X Y ( ) ( ) 2 ( ) ( ) 2 ( ) ( ) 1 2 3 4...
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 Spring '11
 Heberle
 Correlation Coefficient, Standard Deviation, Variance, xy SQUARED

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