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Augmenting inventories with basal area points to achieve desired precision

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An approximation to the variances of the regression and mean of ratios estimators for double sampling is presented that can be used to determine how many basal area points are needed to augment an existing inventory to achieve a desired precision. The approximation may also be used to determine the effective regular sample size to achieve equal precision to a double sample.

L'article présente une approximation de l'estimateur de la variance de régression et de l'estimateur de la moyenne des rapports pour l'échantillonnage double. Cette approximation peut être utilisée pour déterminer le nombre de points de sondage de surface terrière nécessaires à un inventaire existant pour atteindre une précision désirée. L'approximation peut aussi être utilisée pour déterminer la taille effective d'un échantillonnage simple nécessaire pour atteindre la précision d'un échantillonnage double.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2003

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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