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    Author(s): Thomas B. Lynch; David Hamlin; Mark J. Ducey
    Date: 2016
    Source: In:Proceedings of the 18th biennial southern silvicultural research conference. e-Gen. Tech. Rep. SRS-212. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 614 p.
    Publication Series: General Technical Report (GTR)
    Station: Southern Research Station
    PDF: Download Publication  (116.0 KB)

    Description

    Total quantities of tree attributes can be estimated in plantations by sampling on plantation rows using several methods. At random sample points on a row, either fixed row lengths or variable row lengths with a fixed number of sample trees can be assessed. Ratio of means or mean of ratios estimators can be developed for the fixed number of trees option but are not designunbiased. Ducey’s estimator samples a fixed number of trees and is design-unbiased, as is sampling fixed row length. Simulations indicted that some of the ratio estimators could have substantial bias on rows containing large gaps, but for other ratio estimators bias was minimal in practical terms. Ducey’s method is unbiased but had a root mean square error slightly larger than some of the ratio estimators.

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    Citation

    Lynch, Thomas B.; Hamlin, David; Ducey, Mark J. 2016. Simulation of design-unbiased point-to-particle sampling compared to alternatives on plantation rows. In:Proceedings of the 18th biennial southern silvicultural research conference. e-Gen. Tech. Rep. SRS-212. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 2 p.

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