Documentation and Evaluation of Growth and Other Estimators for the Fully Mapped Design Used by FIA: A Simulation Study
Abstract:For the proposed mapped design of the USDA Forest Service, Forest Survey and Inventory (FIA) units, in a simulation study for a realistic mapped population, Grosenbaugh's ingrowth estimator Î1 and Van Deusen's survivor growth estimator ΔS2 are best. If additivity of estimates is desired, ΔY1 should be used for total growth estimation. If additivity is not required, a plausible assumption as FIA users become more statistically literate, Roesch's estimator ΔY4, which is 12% more efficient than ΔY1 should be used if survivor ongrowth trees can be cored to determine their first time period diameters. If not, Grosenbaugh's nonadditive estimator ΔY2 should be used which is 8% more efficient than ΔY1. The classical variance estimator yields unbiased estimates of the variance of the parameter estimates as expected. Area estimation, change in area estimation, percentage of plots in more than one condition, means per tree, and changes in means per tree over time can be estimated reliably if sample size is large enough and conditions or changes in conditions are not too infrequent. The length of boundaries between conditions are consistently underestimated. For. Sci. Monogr. 31:26-45.
Document Type: Journal Article
Affiliations: USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, 240 West Prospect Street, Fort Collins, CO 80526-2098
Publication date: 1995-08-01
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