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Tests of precision of cubic-foot tree-volume equations

, : Tests of precision of cubic-foot tree-volume equations. For. Chron, 37: 2, 123-32

A test of precision of 25 equations was made for each of three species-Pinus banksiana, Picea glauca, and Populus tremuloides. Considering the independent variables of d.b.h. and height only, the equation that combines the highest precision and ease of use is: v = a + b (d.b.h.)2 (total height) where a and b are regression coefficients. With tree form as a third variable the equation having the highest precision is: v = a + b (d.b.h.)2) (total height) X diam. at 1/2(H-4.5)ft./d.b.h.


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