Graphic Computation ofR1.23

Lord recently published a nomograph “for calculating a multiple correlation coefficient (R 1.23) from the zero-order correlations (r 12, r 13, and r 23).” His paper reminded us that in 1947 we developed a graphic method of computing R 1.23. If the sole object is speed of computation, the advantage would doubtless lie with Lord's nomograph rather than with our graphic method. But we might claim two possible advantages to the method outlined in this paper. First, the computation can be carried out on ordinary graph paper. Second, we believe that our graphic method can help many students to understand the basic relationships between the zero-order correlations and the multiple-correlation coefficient.