Richard L. Williamson

Response to Commercial Thinning in a 110-year Old Douglas-fir Stand

Excerpt from Estimating Merchantable Volumes of Second Growth Douglas-Fir Stands From Total Cubic Volume and Associated Stand Characteristics Some of these equations may be unreliable if extrapolated beyond the data. To avoid unreasonable estimates and inconsistencies between estimates to alternative merchant ability limits, users should observe the stated restrictions. The form of the dependent variable used in actual fitting was not the same in all cases and variances were usually not uniform across the range of stand diameters. As a result, multiple correlation coefficients and standard errors of estimate associated with these equations are not readily interpretable other than as an indication that quite close fits to the data were achieved in most cases. Multiple correlation coefficients were greater than for most equations and greater than for many. As would be expected from the erratic nature of mortality, the equations for the mortality component were much poorer in fit; and we give only those for total cubic volume in trees over and over - inch d.b.b. When comparing equations fitted with different forms of the dependent variable, we based our choices on Furnival's (1961) index of fit and on apparent reasonableness of behavior within and at the margins of the data. 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.

Estimating Merchantable Volumes of Second Growth Douglas-Fir Stands from Total Cubic Volume and Associated Stand Characteristics (Classic Reprint)

Robert O. Curtis

Richard L. Williamson

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