Assessing the effect of measurement error in age on dominant height and site index estimates
Abstract:Stand age is often hard to measure accurately. Measurement error in age affects height estimates when height is projected from one age to another age. In this study, our objective was to derive an estimator for the variance of the component of projection error associated with the error in age. To evaluate the estimator, a simulation approach was employed and the results showed that the estimator worked well in most cases. When the variance of the error in age increases and the projection is forward, however, the estimator might not work as well as in other cases. Another objective was to examine how the error in age behaved under different height–age models and to what extent it affected height and site index estimates. The effect of the error in age depended on its magnitude, the height–age model, initial value of dominant height and age, and projection length. It was also shown that the effect was sometimes negligible, but it could be considerable in other cases. Data from 80 ponderosa pine (Pinus ponderosa Dougl. ex Laws.) trees in British Columbia, Canada, were used in an illustrative example.
Document Type: Research Article
Affiliations: 1: Forest College, Beihua University, Huashan Road 3999, Jilin City, Jilin Province 132011, P.R. China. 2: British Columbia Ministry of Forests, Lands and Natural Resource Operations, Forest Analysis and Inventory Branch, P.O. Box 9512, Stn. Prov. Govt., Victoria, BC V8W 9C2, Canada.
Publication date: 2011-08-28
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