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Notes: Model-Based Sampling Versus Point-Poisson Sampling on a Timber Sale in the Roosevelt National Forest in Colorado

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A purposive model-based (MB) sampling scheme called pscX (purposive sampling from the cumulated X's) is compared to point-Poisson (PP) sampling in a timber sale. MB sampling schemes take advantage of the assumed known relationship between the variable of interest (in this case cubic meter volume) and a covariate x (in this case D²H). Field results showed that in this experiment pscX sampling yielded an estimate much closer to a large-sample estimate of total cubic foot volume than the PP-based sample estimate. The pscX-based estimate also was slightly more precise. The pscX procedure is easier to implement in practice because dangerous and difficult-to-measure trees can be intentionally avoided. Additional field comparisons should be made. Forest Sci. 30:652-656.

Keywords: 3-P sampling; Purposive sampling; cubic foot volume; tree basal area; tree height; underlying model

Document Type: Miscellaneous

Affiliations: Forester, Western Oregon Timber Management Unit, Forester, Roosevelt National Forest

Publication date: September 1, 1984

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