Table 6 .- -Equations for predicting whole tree weights (w) of trees less than IS feet in 

 height 



Species : : MSR-' : \ Y / ; n : Equations^ 



Lb^ Percent 



DOMINANTS 



DF, PP, S, AF 



0. 93 



7 



475 



34 



58 



w = 



EXP(-3 



385 



+ 



2 



560 



Inh) 



WP, GF, WBP 



. 90 



9 



925 



52 



42 



w = 



EXP(-2 



876 



+ 



2 



175 



Inh) 



C, L, LP 



.87 



3 



109 



43 



37 



w = 



EXPC-3 



720 



+ 



T 



411 



Ir.h) 



WH 



.71 



4 



745 



77 



11 



w = 



EXP(-4 



824 



+ 



2 



722 



Inh) 











INTERMEDIATES 















C, DF, PP 



.79 



1 



698 



58 



31 



w = 



EXP(-2 



915 



+ 



1 



925 



Inh) 



MSR indicates mean square residuals. For logarithmic functions, MSR was 

 calculated as E(P-0)^/df, where P and are predicted and observed values transformed 

 to arithmetic units and df is the residual degrees of freedom. 



2/ 



These equations are of the form Iny = a + blnX + (mean square error/2). 

 The latter term corrects for bias in transforming logs and is included in the inter- 

 cept term in the equations. The intercept term was adjusted by (mean square/2) 

 when the summation of predicted minus observed values in arithmetic units showed 

 less bias with the correction term than withoQt it. 



Figure 8. — Whole tree weights 

 for trees less than 25 

 feet tall. 



HEIGHT (FT) 



19 



