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The Assessment of Log Class Volumes within Trees by Probit Transformation

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Probit analysis is used in deriving expressions of log class yields in terms of tree size for Pinus patula. After grouping 676 sample tree data into l-inch dbh and 10-foot height classes, the percentage volume of individual log classes were accumulated from the lowest class (pulpwood) up to each of the six sawlog classes as recognized in South Africa. Regression equations of corresponding probits in terms of dbh and tree height were then derived. Upon transforming calculated profits to cumulative percentages, successive substraction rendered a tabulation of relative volume of each log class according to dbh and tree height, in a form for application to the timber cruise on financial yield study.
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Document Type: Journal Article

Affiliations: Professor of Forest Management, Univ. of Stellenbosch, Republic of South Africa

Publication date: 01 September 1963

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