RELATION OF VARIABLES. 



119 



A^a and A^c (0.091 and - 0.268) and divided by 9, gives the second 

 approximation, 1.564, to AD, the third approximation, 0.150, to A^D, 

 and the fourth approximation, — 0.129, to A^D, and so on. Finally, 

 each limiting value, for example, AA = 0.245, is obtained by adding 

 to A A" = 0.037 the sum of all approximations to the first differences 

 A^A, i. e., 0.154 + 0.045 + 0.008 + 0.001. 



TABLE 6. 



JMERiCAL Solution by Method of Successive Approximation of South Dakota Wheat 

 Problem in the Case when Variability within the Group is Neglected. 



