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We measure the extent to which ability of one sort goes with or fails to go with ability of some other sort by the coefficient of correlation between the two.

Table 24 gives the coefficients of correlation derived in this way.

The coefficient of correlation by the method of rank differences is equal to ·03.

Connected with the coefficient of correlation, usually, is a figure for "probable error," which depends, primarily, on the square root of the number of observations.

This is that coefficients of correlation may be either positive or negative.