Relative Efficiency of Two-Dimensional Systematic Sampling
Relative efficiency of systematic and stratified versus simple random sampling for crown area and tree frequency estimation was evaluated on tree-crown maps of 48-acre tracts from five forest types of the Pacific Northwest. Four populations with specified spatial distribution patterns were generated from each tract through computer simulation. Exhaustive two-dimensional systematic sampling was then undertaken with ¼-acre sampling units. Results indicate that relative efficiency of systematic sampling varies, depending on the variable being estimated and the spatial distribution of trees in the stand. Systematic sampling was more precise than simple random sampling for estimating both variables of interest when applied to the original forest types. It was less precise than simple random sampling when applied to uniformly spaced populations. Forest Sci. 16: 271-276.
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Document Type: Journal Article
Affiliations: Research Scientist, Forest Research Laboratory, Dep. of Fisheries and Forestry, Canadian Forestry Serv., Sault Ste. Marie, Ontario
Publication date: 1970-09-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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