52 STATISTICAL METHODS. 



I. -FORMULAS. 



M = - = V m - Vl . P.E. M = 0.6745-4=. x = V - M. 



. 



_ . _ 0>7979(ri p _ o.6745<r. 

 n 





"i 2 (+ I) = 2(a V /) (+ I). 



v 



Ms 2 



% (for graduated variates) = i ~ a . 100*. 



>v?l 

 S 



A^ (for integral variates) = 2^, 7. . 100$, where fc equals the number of classes. 



/ . K 



2(dev. x . dev. y . /) 

 p = - 

 ?i(T 1 cr 3 



n n 



0.6745(1 - p) 



Po (spurious correlation) = 



(J-J 



(index of heredity, uniparental inheritance) = p . 



ii = pj 7i 2 + PO 7i 3 [biparental inheritance; unassortative mating]. 



- - 



_ Pi ~ PiPa ^ fj;, j^ Pa "" PiP . ^i . /j. [biparental inheritance; assortative 

 1 - Pi ^a 1 ~ Pi "a 



mating], 



