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    Author(s): Stanley J. Zarnoch; Jeffery A. Turner
    Date: 2005
    Source: Res. Pap. SRS-38 Asheville, NC: U.S. Department of Agriculture, Forest Service Southern Research Station. 4 p.
    Publication Series: Research Paper (RP)
    Station: Southern Research Station
    PDF: View PDF  (380 KB)

    Description

    The 2001 Kentucky Forest Inventory and Analysis survey overestimated hardwood saw-log volume in tree grade 1. This occurred because 2001 field crews classified too many trees as grade 1 trees. Data collected by quality assurance crews were used to generate two types of adjustments, one based on the proportion of trees misclassified and the other on the proportion of saw-log volume misclassified. Measures of variability for the estimated proportions were based on a cluster sampling design. Both methods significantly reduced estimated saw-log volume in tree grade 1. We believe that the saw-log volume approach is superior to the tree approach, but that both approaches generate improved estimates of tree grade saw-log volumes. The standard errors of the adjustment proportions are given and can be used to calculate standard errors of the adjusted values.

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    Citation

    Zarnoch, Stanley J.; Turner, Jeffery A. 2005. Adjustments to forest inventory and analysis estimates of 2001 saw-log volumes for Kentucky. Res. Pap. SRS-38 Asheville, NC: U.S. Department of Agriculture, Forest Service Southern Research Station. 4 p.

    Keywords

    Cluster sampling, Forest Inventory and Analysis, quality assurance, saw-log, tree grade

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