A Review of Methods for the Sampling of Timber

Efficient methods for the sampling of timber are discussed, and comparisons are made with those methods specified in various timber testing standards. The importance of a random process of selection is emphasized. Accurate estimates of species properties depend mainly on the number of trees properly sampled and not on the total number of specimens tested. The most efficient, and often most economical, sample consists of only one specimen from each tree; such a sample has been found satisfactory in practice. Topics covered include the general principles of sampling, calculation of the species mean and its standard error for an unstratified sample, size of sample for standard mechanical testing, sampling plans in standard specifications, and variation of properties within the tree. Formulas are given for the calculation of species mean and its standard error for a stratified sample.

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