Excerpt from Identifying Proxy Sets in Multiple Linear Regression: An Aid to Better Coefficient Interpretation Regression analyses are usually expressed in terms of a dependent variable, which we call a response vari able. Likewise, we use the term explanatory variable to indicate what is often called an independent vari able. Our reason for not using the terms dependent and independent is to avoid confusion when we dis cuss mathematical independence (orthogonality), a condition that plays a critical role in this article. 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.