Abstract
The alignment chart may be used to calculate the fourfold point correlation coefficient for any fourfold table. If the categories into which each variable of a fourfold table is classified are termed "successful" and "unsuccessful," then the values needed to enter the chart are: A, the per cent of cases successful with respect to the first variable; C, the per cent of cases successful w,ith respect to the second variable; and Q, the per cent of those cases successful with respect to the second variable that were also successful with respect to the first variable. To use the alignment chart: Find the straight line in the central part of the chart that corresponds to the desired values of A. Find the intersection of this line with the curved line tha t corresponds to the desired value of C. By means of a straightedge connect this intersection with the point on the linear scale at the left that corresponds to the desired value of Q. Read the value sought for the fourfold point correlation coefficient where the straightedge intersects the R scale on the right.
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