Pekka Kilkki , Risto Päivinen

Weibull function in the estimation of the basal area dbh-distribution.

Kilkki P., Päivinen R. (1986). Weibull function in the estimation of the basal area dbh-distribution. Silva Fennica vol. 20 no. 2 article id 5270. https://doi.org/10.14214/sf.a15449

Abstract

The paper demonstrates the possibility of using data from small relascope sample plots in the derivation of the regression models which predict the Weibull function parameters for the dbh-distribution. The Weibull parameters describing the basal area dbh-distribution were estimated for relascope sample plots from the Finnish National Forest Inventory. In the first stage of the estimation nonlinear regression analysis was employed to derive initial parameter estimates for the second stage, in which the maximum likelihood method was used. The parameter estimates were employed as dependent variables for the derivation of the regression models; the independent variables comprised of the compartment-wise stand variables generally estimated in ocular inventories.

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Keywords
Pinus sylvestris; diameter distribution; beta function; nonlinear regression; maximum likelihood; initial parameter estimates; relascope sample plot

Published in 1986

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Available at https://doi.org/10.14214/sf.a15449 | Download PDF