You are here: Home
/ Publication Information
Title: New Models for Predicting Diameter at Breast Height from Stump Dimensions
Author: Westfall, James A.;
Source: Northern Journal of Applied Forestry, Volume 27, Number 1, March 2010 , pp. 21-27(7)
Publication Series: Scientific Journal (JRNL)
Description: Models to predict dbh from stump dimensions are presented for 18 species groups. Data used to fit the models were collected across thirteen states in the northeastern United States. Primarily because of the presence of multiple measurements from each tree, a mixed-effects modeling approach was used to account for the lack of independence among observations. The heterogeneous error variance was described as a function of stump diameter, which allowed for more accurate representation of prediction intervals. Application of the mean response model (fixed-effects parameters only) to independent data indicated an average absolute error between 0.2 and 0.7 in. for most groups. An additional advantage is that random-effect parameters allow the model to be calibrated to local conditions if some additional data are available. An example is provided that indicates the local calibration results in a mean residual value that is closer to zero compared with the mean response model. Efforts in other locales to use stump information to inform dbh predictions can obtain the same advancements by adopting a similar modeling methodology.
Keywords: mixed-effects model, stand reconstruction, heterogeneous variance, prediction interval
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
XML: View XML
Westfall, James A. 2010. New Models for Predicting Diameter at Breast Height from Stump Dimensions. Northern Journal of Applied Forestry. 27(1): 21-27.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility