Gross Soribner Board Foot Volume — Un forked Trees 



Gross Scribner board foot volume to a 6-inch top in an unforked tree is predicted by 



V = V X R , 

 S I S/I 



where 



Vg = Predicted gross Scribner board foot volume to a 6-inch top in an unforked 

 tree 



Vj = Predicted gross International board foot volume to a 6-inch top in an 

 unforked tree 



Rg ,j = Predicted ratio of actual gross Scribner board foot volume to a 6-inch top 

 in an unforked tree divided by predicted gross International 1/4-inch board 

 foot volume to a 6-inch top in an unforked tree. 



Like International 1/4-inch board foot volume, this equation was fitted using weighted 

 least squares regression through the origin. The resulting ratio equations, Rg^j. are 

 of the form: 



^-1 ^-1.1777148 ^-2 

 Rg^j = So - eiD - - 630 



where 



D = D.b.h. in inches. 



The sp-NF specific, weighted regression coefficients for f^g^j. their RMSQR, and the 



number of trees used can be found in table 9. Methodological details can be found in 

 appendix VIII. 



Table 9. — Unforked tree ttcss Scribner board 'oot volume to a €-inch top data base and reareesion results 



Species 



National Forest 



Number 

 of [ 

 trees 





eo ; 



Rearess ion 

 ei [ 



coef f ic 1 ents 



ei \ 







Relative 

 mean squared 

 residual 



(RMSQR) 



White pine 



Santa Fe , Carson, Lincoln 



32 



1 



00608608 



2.38465985 



0.00 







00 



0.0204 



Engelmann spruce-corkbark fir 



Santa Fe, Carson, Lincoln 



71 





878453705 



.00 



.00 



15 



9984577 



. 1638 



Yellow pine 



All 



200 





982101210 



.926027395 



.00 



14 



49443523 



.0486 



Blackjack pine 



Lincoln, Coconino, Tonto 



402 





96579222 



.40579028 



.00 



16 



93678414 



.1035 



Blackjack pine 



Santa Fe, Carson 



168 





993986685 



1.463486622 



.00 



12 



40584877 



.1196 



Douglas-fir 



Lincoln, Tonto 



83 



1 



000897473 



.00 



4.100072359 











.0324 



Douqlas-f ir 



Santa Fe, Carson 



48 





870259997 



.00 



.00 



19 



49594193 



.0455 



Aspen 



Santa Fe, Carson 



38 





887891 



.00 



.00 



17 



19374 



.0831 



White fir 



Lincoln 



36 



1 







1.88814412 



.00 



8 



85144911 



.0233 



White fir 



Santa Fe , Carson 



31 



1 



01724769 



1.87056853 



.00 



8 



51445088 



.0376 



13 



