Author: Van Deusen, Paul C.

Source: Canadian Journal of Forest Research, Volume 37, Number 6, June 2007 , pp. 1142-1145(4)

Publisher: NRC Research Press

Abstract:

Forest inventory data are often summarized in tabular format where rows and columns represent levels of categorical variables. It is generally desirable to constrain tables based on different categories to sum to common totals. It may also be desirable to develop a system that incorporates stratification. Weights can be assigned to inventory plots to achieve these goals with weighted estimators. The justification for weighting is presented here along with approaches for defining reasonable weights. A weighted estimator is developed to constrain tables derived from mapped plot data to add to common totals.

Les données d'inventaire forestier sont souvent résumées sous forme tabulaire où les lignes et colonnes représentent les niveaux des variables nominales. Il est généralement souhaitable de faire en sorte que les tableaux basés sur différentes catégories aient des totaux communs. Il peut aussi être souhaitable de développer un système qui introduit une stratification. Des poids peuvent être attribués aux placettes d'inventaire pour atteindre ces objectifs en faisant appel à des estimateurs pondérés. La justification de la pondération est présentée ici avec des approches pour définir les poids raisonnables. Un estimateur pondéré est développé pour faire en sorte que les tableaux dérivés des données de placettes cartographiées aient des totaux communs.

Document Type: Research article

Publication date: 2007-06-01

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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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