Where:
N: number of pairs of scores
${\sum}xy$: sum of the products of paired scores
${\sum}x$: sum of x scores
${\sum}y$: sum of y scores
${\sum}x^2$: sum of squared x scores
${\sum}y^2$: sum of squared y scores
Where:
N: number of pairs of scores
${\sum}xy$: sum of the products of paired scores
${\sum}x$: sum of x scores
${\sum}y$: sum of y scores
${\sum}x^2$: sum of squared x scores
${\sum}y^2$: sum of squared y scores