ABSTRACT
IT has been stated in an earlier section that in this preliminary study of special abilities the experimenter aimed throughout at drawing the broad distinction of “good” or “bad” with regard to the testees' performance on each test rather than at grading the group accurately. It has been shown that, on the whole, this aim was achieved. We are now to consider the value of the data from the point of view of the finer grading which is influential in determining the coefficients of correlation. Let us consider first the reliability coefficients which show how the results for one application of a given test correlate with another application of the same test. In the following Table the highest and the lowest for any group on each test is given together with the Probable Error.
