Book excerpt: Excerpt from Methods Used in Computing Rail Freight-Rate Indexes for Farm Products The elements involved in the index computation are the (1) base period, (2) selection of traffic sample, (3) assignment of weights to each movement in traffic sample, (4) selection of representative type rates, and (5) measure of seasonality in annual shipment pattern. 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.