Table 5 . - -Regression and variance analysis 



for height of infestation X d.b.h. 



Table 6. --Regression and variance analysis 



for attack density X d.b.h. 



Regression matrix 



: N : X : Y :D.F. 



N 80 974.10 2052.00 



X 12799.57 26485.66 



Y 58716.50 80 



X 938.68 1500.00 



Y 6082.70 79 



Y 3685.72 78 



Analysis of variance 



Source: SS :D.F.: MS : F 



Bo 52633.80 1 



Bi 2396.98 1 2396.98 49.42** 



Res. 3685.72 76 48.50 



Total 58716.50 



X = D.b.h. 



Y = Height of infestation 



WASATCH PLOT 

 Regression matrix 



N : X : Y :D.F. 



N 40 487.50 398.00 



X 6414.29 5160.90 



Y 4454.00 40 



X 472.88 310.28 



Y 493.90 39 



Y 290.31 38 



Analysis of variance 



Source :D.F.: SS : MS : F 



Bo 1 3960.10 



Bi 1 203.59 203.59 27.96** 



Res. 38 290.31 7.64 



Total 4454.00 



TETON PLOT 

 Regression matrix 



N : X : Y : D.F. 



N 40 486.60 530.00 



X 6385.28 6792.40 



Y 8016.00 40 



X 465.79 344.95 



Y 993.50 39 



Y 738.04 38 



Analysis of variance 



Source: D.F. : SS : MS : F 



Bq 1 7022.50 



Bi 1 255.46 255.46 13.15** 



Res. 38 738.04 19.42 



Total 8016.00 



X = D.b.h. 



Y = Density of attack 



11 



