. Lumber recovery from ponderosa pine in northern California. Lumber; Ponderosa pine California, Northern. Because the average lumber values used to estimate the regressions were based on WWPA quarterly index prices, adjustments to the value can be easily made when prices fluctuate. Values can be updated by multiplying the average value by the proportional change in the index. For example, the index price for coast- inland north ponderosa pine for December 1982 was $, and the quarterly average for April-June 1983 was $; the lumber prices can be updated by multiplying the average lo
. Lumber recovery from ponderosa pine in northern California. Lumber; Ponderosa pine California, Northern. Because the average lumber values used to estimate the regressions were based on WWPA quarterly index prices, adjustments to the value can be easily made when prices fluctuate. Values can be updated by multiplying the average value by the proportional change in the index. For example, the index price for coast- inland north ponderosa pine for December 1982 was $, and the quarterly average for April-June 1983 was $; the lumber prices can be updated by multiplying the average log value by $ divided by $ Direct Product Estimators Direct product estimators can be a useful tool for land managers or timber buyers. The advantage is that only cubic volume and number of logs are needed for pre- dicting lumber and chip volume and lumber value. Lumber volume in board feet was predicted for old- and young-growth logs (fig. 7). A comparison of the regres- sion lines showed that they were different which coincides with the results of the other recovery predictors for board feet, BF/CF, and OR. The volume of chips in cubic feet is predicted for all logs by use of the equation: Chip volume (ft3) = (number of logs) + (net cubic scale). r2 = ; MSE = 0 50 100 150 200 250 300 Log scale (cubic feet) Figure 7.—The volume of lumber in board feet can be estimated from the net cubic scale. Old growth: BF = (number of logs) + 7 835(net cubic scale) R2 = ; MSE = 3630. Young growth: BF = (number of logs) + (net cubic scale). R2 = ; MSE = 625. 14. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ernst, Susan. cn; Pong, W. Y. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ) cn. [Portland, Or. ] : U. S. Dept. of Agricul
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectlumber
