Aspen Bibliography

Title

Evaluation of stem taper functions for estimating log volume assortments

Authors

J. Gal
I.E. Bella

Document Type

Article

Journal/Book Title/Conference

Forestry Chronicle

Volume

71

Issue

6

First Page

743

Last Page

746

Publication Date

1995

Abstract

Using three recently fitted taper functions, this note evaluates the accuracy and precision of log volume assortment estimates for five major Saskatchewan timber species. All three functions showed similarly good performance for the five species examined. The results indicated that the magnitudeo f both absolute bias and standard error of estimate depended on the average volume of the particular log assortments; larger average volumes had greater bias and standard errors of estimate. The coefficients of variation were inversely related to average log assortment volume, with the smallest assortment volumes having the largest coefficients. This results from the high variation relative to those small averages. This also means that estimates of log volume assortments would always be less accurate than those of the entire merchantable stem.