A comparative study of three log rules commonly used in the Pacific Northwest, U.S.A. Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tm70mz12g

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  • A comparative study was done on data collected by Weyerhaeuser Company on l,6144 second-growth Douglas-fir, Pseudotsuga menziesii, trees. The variable used in the study was the percent difference, positive or negative, between the volumes given by each of three different log rules and the standard tree volumes determined by Weyerhaeuser Company. The data were analyzed in a two-way analysis of variance and factors, log rules and DBH classes were highly significant (99% level). Comparative tests (LSD for unequal sample size) were done on pairs of log rules means as well as on pairs of DBH classes for each log rule. All the differences between means are presented and significances are summarized and discussed. A regression analysis was performed between percent difference volume as the dependent variable and DBH as the independent for each log rule. Results showed no significant differences and the coefficients of determination were very low.
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