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    • Tree-Ring Bulletin, Volume 50 (1990)
    • Tree-Ring Bulletin, Vol. 50 (1990)
    • View Item
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    Evenness Indices Measure the Signal Strength of Biweight Site Chronologies

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    Author
    Riitters, Kurt H.
    Affiliation
    ManTech Environmental Technology, Inc., Research Triangle Park, North Carolina
    Issue Date
    1990
    Keywords
    Dendrochronology
    Tree Rings
    Dendroclimatology
    Forest Trees
    Growth Rings
    Methodology
    Trees
    Variation
    Woody Plants
    
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    Rights
    Copyright © Tree-Ring Society. All rights reserved.
    Collection Information
    This item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive. It was digitized from a physical copy provided by the Laboratory of Tree-Ring research at The University of Arizona. For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at editor@treeringsociety.org.
    Publisher
    Tree-Ring Society
    Journal
    Tree-Ring Bulletin
    Citation
    Riitters, K. 1990. Evenness indices measure the signal strength of biweight site chronologies. Tree-Ring Bulletin 50:21-27.
    Abstract
    The signal strength of a biweight site chronology is properly viewed as an outcome of analysis rather than as a property of the forest-climate system. It can be estimated by the evenness of the empirical weights that are assigned to individual trees. The approach is demonstrated for a 45-year biweight chronology obtained from 40 jack pine (Pinus banksiana Lamb.) trees. The annual evenness of the empirical weights is calculated by indices derived from the Shannon and Simpson diversity indices, and the variances are found by the jackknife procedure. The annual estimates are then averaged to find an overall estimate of biweight signal strength for the 45-year period. These techniques are most useful for determining sample sizes for the biweight procedure, and for comparing different methods of detrending and standardizing data sets prior to applying the biweight mean-value function.
    ISSN
    0041-2198
    Additional Links
    http://www.treeringsociety.org
    Collections
    Tree-Ring Bulletin, Vol. 50 (1990)

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