XXXIV] 



> 



s 



Introduction 



First Variate A. 



lix 



Illustration (ii). Find r^ by mean contingency for the table on p. Ix: 



The sum of the positive contingencies is 169'846, or we have mean contingency 

 ^r = -170, whence the diagram leads us to r^ = '480. The marginal frequencies are 

 the same as in Illustration (i). Thus we have 



The table gives actually a true Gaussian distribution with correlation -500. 

 It will be seen from Illustrations (i) and (ii), that if the distribution be Gaussian, 

 even if the marginal frequencies are in fairly irregular groupings, r# will be 

 reasonably close to the true contingency, and corrected as suggested above will 



give excellent results. 



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