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A Method for Determining the Precision of Site Index Estimates Made From Site Index Prediction Functions

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Errors in estimating even-aged stand site indexes from site index prediction functions come from three sources: (1) the prediction of individual sample tree site indexes from the site index/height regressions, (2) the variation among sample tree heights within even-aged stands, and (3) measurement error. A method is presented for quantifying and combining the first two of these sources of error into site index confidence intervals, and the effect of measurement error is demonstrated with simulated error data. Confidence intervals are presented for white, black, and scarlet oak stands in southeastern Missouri for 1- to 5-, 10-, and 20-tree samples for tree ages 0 to 80. The width of the confidence intervals decreases with increasing (1) numbers of sample trees, (2) proximity to the index age, and (3) precision of the tree measurements. Forest Sci. 24:289-296.
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Keywords: Quercus alba; Quercus coccinea; Quercus velutina; confidence intervals; measurement error

Document Type: Journal Article

Affiliations: Research Foresters, North Central Forest Experiment Station, Forest Service, USDA, Columbia, Missouri

Publication date: 1978-06-01

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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:
    Journal of Forestry
    Other SAF Publications
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