Variance estimation for volume when D2H is the covariate in regression

Schreuder, Hans T.; Anderson, Jana C.

doi:10.1139/x84-144

Cited by 4 publications

(2 citation statements)

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“…In forestry literature, there are plenty of mathematical models which have been used by various authors in the construction of volume-tables and volume equations [12,13], while recent developments in this area were reported by [14][15][16][17][18][19][20][21][22]. In most cases, those models were found to be suitable for use in specific forests.…”

Section: Construction Volume Equationsmentioning

confidence: 99%

"Development of Volume Function for Final Felling of Pinus brutia Ten in Kurdistan Iraq"

Hakeem

2018

EAES

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Planning for forest management depends upon the forest dynamics, which includes integration of all forest disciplines and understanding of forest resource characteristics including its growth dynamics. The forest growth and yield modelling can provide valuable information about forestry which can be used to determine harvest levels or allowable cut, and to analyze alternative stand treatments. Growth and yield models are generally used to predict the temporal development of forest stands. Knowledge of Diameter at Breast Height (DBH) and total tree height is fundamental to both developing and applying many growth and yield models [1]. Among the several available approaches in the yield prediction methodology, the multilevel model approach, which is a statistical technique, found to be commonly used in many fields of study for generating improvements in parameter estimation .A volume estimation of a forest stand is a good example. Volume estimation in the form of volume function and volume table has been widely used for many different purposes in forestry for more that hundred years including forest plantations and an inventory for timber harvesting. In view of the importance of these functions in forestry, this study was conducted with the main aim to develop a volume function for Pinus brutia Ten, which is a very common forest tree species planted in northern Iraq. The least squares method was used to fit eight unweighted volume equations including two logarithmic transformed equations and seven weighted forms of volume equations to volume data of a 25-30 years old Pinus brutia Ten plantation. The best fit equation was done using Furnival's index.

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Section: Construction Volume Equationsmentioning

confidence: 99%

"Development of Volume Function for Final Felling of Pinus brutia Ten in Kurdistan Iraq"

Hakeem

2018

EAES

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“…Parameters for the two-part model (eq. 2) were determined using weighted regression with DSQH raised to the -1 .5 power as the weight (Schreuder and Anderson 1984).…”

Section: Modelingmentioning

confidence: 99%