-63- 



Stratum W n'W 



Totals 1.000 122 



By the second technique of allocation, called Neyman allocation , the forester 

 takes into account the coefficient of variation as well as the relative 

 acreage in each stratum in assigning sample units to strata. Neyman allocation 

 minimized the number of sample units required to achieve a specified precision. 

 The equation for sample size is 



2 



n = i-^]' 



T. W CV 

 1=1 



-i2 



Equation 3 



To apply this equation to the data given above we require the following 

 computations : 



Assuming an allowable error of 10 percent with 95 percent confidence, the 



forester estimates the number of points required. 



-i2 



n = [^]' 



1 W CV 

 i=l ^ 



= [j|-] (50.75)^ = 103 points 



The points are allocated to strata as follows ; 



Proportional and Neyman allocation are two of the most common allocations. 

 Other techniques of allocation are given in the references cited. 



