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    Author(s): S. P. Verrill; D. W. Green
    Source: (Research paper FPL ; RP-558):105 p. : ill. ; 28 cm.
    Publication Series: Research Paper (RP)
    Station: Forest Products Laboratory
    PDF: Download Publication  (4.6 MB)


    In recent years wood strength researchers have begun to replace experimental unit allocation via random sampling with allocation via sorts based on nondestructive measurements of strength predictors such as modulus of elasticity and specific gravity. Although this procedure has the potential of greatly increasing experimental sensitivity, as currently implemented it can easily reduce sensitivity. In this paper we discuss the problem and we present solutions. Given the existence of nondestructive measurements of strength predictors, our methods can be used to reduce sample sizes. We have written a public domain computer program that implements the methods.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Verrill, S. P.; Green, D. W. Predictor sort sampling, tight t`s, and the analysis of covariance : theory, tables, and examples. (Research paper FPL ; RP-558):105 p. : ill. ; 28 cm.


    Statistical analysis, Sampling, Covariance, Experimental design

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