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Comparing Double-Sampling Efficiency Using Various Estimators with Fixed-Area and Point Sampling

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In this study, we compare the efficiency of double sampling using point sampling and fixed-area plots for sawtimber volume estimates in a mixed-hardwood, oak-dominated stand. Multiple sample sizes and combinations were evaluated to determine optimum double-sample ratios. Results indicated that double, point-sampling schemes are more efficient in terms of field time and sampling errors than double-sampling schemes incorporating fixed-area plots. Data suggested that the most efficient ratio of measured and nonmeasured points with double sampling varies on the basis of the nonmeasured variable used and desired SE percentage levels for the inventory.
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Keywords: double-sample ratio; inventory; relative efficiency; sawtimber; volume

Document Type: Research Article

Publication date: 01 June 2008

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