Table 4.— Predicted versus observed tree loss by year based on q,, the average probability of tree 

 loss by tree diameter class and stand (Situation B, Burnell 1977, grouped by total stand) 



Number of trees 



Year of per acre Predicted 



infestation 1/D, q. tree loss 





 1 

 2 

 3 

 4 

 5 

 6 

 7 



370.2 

 366.6 

 365.8 

 346.3 

 329.9 

 252.1 

 220.3 

 210.0 

 Total loss: 



3.6 



0.278 



0.997 



6.6 



.8 



1.250 



.997 



1.5 



19.5 



.0513 



.997 



34.1 



16.4 



.0609 



.997 



27.3 



77.8 



.0128 



.999 



106.5 



31.8 



.0315 



.992 



37.1 



10.3 



.0971 



.987 



11.1 



















160.2 



Average: 



.995 



224.2 



0.5/ha) 







(560.5/ha) 



110 I- 



100 - 



All Diameters 



80 



70 



^ 60 



en 



Actual 

 Predicted 



YEAR 



Figure 4.— Predicted versus ob- 

 served tree loss by year based on 

 Qf, by tree diameter class, grouped 

 and total stand (Situation B, 

 Burnell 1977). 



9 



