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A Segmented Distribution Approach for Modeling Diameter Frequency Data

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Different functions, each in the form of a modified Weibull cumulative distribution function (cdf), were joined together to form a segmented cdf to approximate diameter distributions in forest stands. Estimates of five percentile points (the 0th, 25th, 50th, 75th, and 100th percentiles) were used to determine a segmented cdf. The segmented cdf and the Weibull distribution were fit to diameter data from 252 plot measurements from both thinned and unthinned loblolly pine plantations. Based on the one-sample Kolmogorov-Smirnov goodness-of-fit statistic, the segmented cdf was found to perform no better than the three-parameter Weibull distribution for data from unthinned stands, but was superior in case of thinned stands. The segmented cdf is very flexible; it should be useful for modeling irregular data such as diameter distributions of thinned stands or mixed stands. Forest Sci 30:129-137.
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Keywords: Pinus taeda; Weibull distribution; cumulative distribution function; loblolly pine; stand-level model; thinning; yield prediction

Document Type: Journal Article

Affiliations: Thomas M. Brooks Professor of Forestry in the Department of Forestry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

Publication date: 1984-03-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
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