VIII IX] 



Introduction 



Ixi 



From these two sets of values we can write down the values of z 9tK , i.e. those of 

 dfN, for the above formula. There result the following numbers : 



t g x =djN= When r=- -20 When r=- -M 



= 1231,5228 .1159,1120 

 ul )} 1745 2052 



1,1)} + 579 + 653 

 L,O)} 5909 

 LI){ - 6160 



{(1 



+ X) ( 0%i + 

 Hence by linear interpolation : 



6312 

 6480 



1230,1993 



2086. 



1157,6929 



If we use only the first term, the hyperbolic formula, we have : 



6406 



= --20- 



72411 



x -05 = -'2044. 



This would be a sufficiently accurate value of r for most practical purposes. 



Illustration (iv). The following table illustrates the influence of Wage of Father 

 on the nature of the Mother's Employment : 



Employment of Mother. 



Clearly d is the category 39, and the correlation in the table thus arranged is 

 negative. We have : 



1(1 - a h ) = = '317,287 ; | (1 - fc ) = = -452,954. 



Accordingly 



d/N= -085,3392, and h = '47530, k = -11821. 

 6 = -7530, < = -2470; x =-1821, ^ = -8179; 

 = -20202, <x = '04498, ^=-61588, X = -13712; 

 -03100, i x* = '02482. 



