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STATISTICAL ANALYSIS OF A VARIABLE PLOT CRUISE USING BRUCE 'S METHOD 



(Bruce 1961) 



Notation 

 y - volume points 



a - all points 

 n - number of points 



TC 



tree count 



VBAR 



volume to basal area ratio 



VOL 



volume per acre 



SE 



standard error expressed as a percent 



CF 



correction factor 



Example of Notation ; 



SE - standard error of the tree count on all points expressed as a 

 a percent 



Estimated volume = VOL 



TC /n 



g g 



TC /n 

 Y Y J 



= (VOL • TC • n )/(TC • n ) 

 Y a Y Y a 



/ 2 2 



Uncorrected standard error = / SE,„.„ + SE 



. / VBAR TC 

 V Y a 



Corrected standard error = CF- (uncorrected standard error) 



/OL 



^hc 



where CF = 



<AR +< 

 Y Y 



