34 



STATISTICAL METHODS. 



in the first quadrant multiplied by the frequency. Since these 

 are negative values they will be actually added. 



(3) Add the sum of the numbers in the first quadrant ; sub. 

 tract the sum of the products of the integral parts of the rel- 

 ative deviations by the frequency in the second quadrant ; 

 subtract the sum of the products of the subject deviations of 



he third quadrant multiplied by their frequency. 



(4) Divide the algebraic sura of (1), (2), and (3) by the number 

 of variates, and from the quotient subtract the product of the 

 complement-fractional parts of the mean value of the subject 

 and relative. 



To get p, divide 



n 



by the product of <TI and o- 2 . 



The probable error of the determination of /j is 



0.6745(1 - p') 



- 



p) 



Example. Correlation in number of Mullerian glands on 

 right and left legs of 2000 male swine. 



