Table 9.— Coefficients for estimating ln(foliage weight) 

 of trees 3.5 Inches and larger: 

 \n(WT) = bo, - biln(D) - b2ln(H) - balniCi) 

 - b4ln(4) - hslniTPA) - beHDREL) 



Species^ 



Variable coefficients 

 Intercept 



bo, 



BP 

 WP 

 WC 

 WL 

 WH 

 AF 

 GF 

 ES 

 DF 

 PR 

 Variables 

 ln(D) b, 

 ln(H) b2 

 In(CL) bg 

 ln(A) b4 

 In(TPA) bs 

 In(DREL) be 

 Regression sum of squares d.t. 

 Error sum of squares/d.f. 

 Mean square error 



2.62251 



2.66607 



3.05935 



1 .75654 



2.65457 



3.06017 



3.11508 



3.30085 



2.70587 



2.45249 

 Variable coefficients 

 = 2.08624 

 = -1.07705 

 .69082 

 = - .30885 

 = - .14210 

 .39924 

 = 160.85490/15 

 = 13.03465/98 



0.13301 

 0.9250 



In developing an equation for foliage weight prediction for 21 

 trees less than 3.5 inches (8.9 cm) d.b.h., the general model 

 form is; 



\n(WT) + bo + biln(CZ.) + bMA) + b^TPA) 



The analysis of variance of species by parameter interactions 

 for this model is shown in table 1 1 . Varying the intercept and 

 In(CL) by species resulted in significant improvement while 

 maintaining consistency in signs between species. Improve- 

 ments due to varying other parameters by species were also 

 significant, but integrity of sign was no longer maintained. 

 Therefore, the model chosen for predicting foliage weight of 

 trees less than 3.5 inches (8.9 cm) is: 



\n(WT) = bo, + biln(C/.) + bzHA) + bjHTPA) 



where the subscript / denotes a parameter varying by species. 



'See text page 2 for species list. 



Table 10. — Summary of residuals (natural scale) from prediction equations for 

 foliage weight of trees. Bias adjustment factors are 1.069 for trees 

 greater than or equal to 3.5 Inches, and 1.126 for trees less than 3.5 

 inches 



Trees s;3.5 inches d.b.h . Trees <3.5 inches d.b.h . 



^ (obs-pred) X (obs-pred) 



No. of without with bias No. of without with bias 



Species^ trees correction correction trees correction correction 



BP 



4 



0.44 



-3.92 



12 



1.31 



-0.07 



WP 



2 



-2.77 



-4.65 



17 



1.85 



- 1.90 



WC 



22 



-218.20 



-330.13 



25 



5.77 



.55 



WL 



3 



-.05 



-.98 



15 



-.16 



-1.90 



WH 



4 



1.51 



-5.23 



16 



1.34 



-2.96 



AF 



10 



-2.22 



-30.10 



15 



5.51 



.28 



LP 











12 



0.01 



-1.26 



GF 



17 



48.58 



-4.29 



29 



3.88 



-5.35 



ES 



3 



4.16 



-5.42 



14 



1.56 



-3.13 



DF 



20 



- 52.94 



- 172.73 



28 



7.61 



1.43 



PP 



29 



515.50 



362.32 



27 



5.15 



1.10 



Weighted mean 













residual (lbs tree) 



86.89 



-5.69 





3.71 



-1.12 





(kg/tree) 



(39.41) 



(-2.58) 





(1.68) 



(-0.51) 



'See text page 2 for species list. 



9 



