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Analyzing APS Models Statistically
R-square
 
The R-square returns the square of the Pearson product moment correlation coefficient, which consists of a dimensionless index that ranges from -1 to 1 and reflects the extent of a linear relationship between two data sets.

The Pearson product moment correlation coefficient Ri of an individual program i is evaluated by the equation:

where P(ij) is the value predicted by the individual program i for sample case j (out of n sample cases); and Tj is the target value for sample case j.
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