model includes all species separately and the reduced 

 model groups all species into one equation. The F-value 

 is very small, indicating one correction equation is 

 sufficient. 

 The equation is: 



Metric d.b.h. = -0.0128 + 1.0065 English d.b.h. 



Sample size = 1,783 trees 



A plot of the actual minus predicted values (residuals) is 

 shown in figure 2. 



R 

 E 

 S 

 I 

 D 

 U 

 R 

 L 

 S 



0.6H 



0.5 ■ 



0.4 - 



0.3 - 



0.2 



0. 1 



0.0 



-0. 1 - 



-0.2 - 



-0.3 - 



-0.4 



-0.5 - 



xx 



>5<X X 

 X 



X 



X 



X 



XXX X 

 Xx 



X X 

 X X 



Xx 



X 

 XX 



Xx 



xxx 



XK 



>x 



>S4X3K 



XX 



Xx 



x^ 



XK 



X 



X X 

 X 

 X 



X X 



XX 



X 



Xx X 



^>*<Xx X 



X 



X 



X 



XX>5«x 



Xx 



>5< 



XX 



x«:; 



ym X 



X 



^ X 



>xx 



x»: 



XX 



XX 



XX 



X 



5 7 



11 13 15 17 

 PREDICTED VALUE 



19 



21 



23 



25 



Figure 2.— A random subsample of residuals and 

 predicted values for the model: metric d.b.ti. = -0.0128 

 + 1.0065 Englisti d.b.h. 



5 



