Excerpt from Mathematical Contributions to the Theory of Evolution, Vol. 16: On Further Methods of Determining Correlation It involves finding the mean-square difference of the values Of the pairs Of correlated characters. It is possible, however, to find rzy from about one half these differences, if we assume the distribution to be normal. More generally I proceed as follows. Suppose the function ma: ny formed, where m and n are at present indeterminate positive constants, and let the positive values only of this expression be taken and divided by the total frequency M Then it will be possible to determine r from this result. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.