Excerpt from An Introduction to the Theory of Mental and Social MeasurementsExperience has sufficiently shown that the facts of human nature can be made the material for quantitative science. The direct trans fer of methods originating in the physical sciences or in commercial arithmetic to sciences dealing with the complex and variable facts of human life has, however, resulted in crude and often fallacious meas urements. Moreover, it has been difficult to teach students to esti mate quantitative evidence properly or to obtain and use it wisely, because the books to which one could refer them were too abstract mathematically or too specialized, and omitted altogether much of the knowledge about mental measurements most needed by the majority of university students.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.