COEFFICIENTS OF VARIATION 



225 



TABLE 141 

 Coefficient of variation in body weight for total population by the ordinary method, 

 and on litter basis (fraternal variation) estimated by various 

 methods (Jackson, 'IS). 



Total population 



(ordinary method) 



Litter basis 



(average of litters calcu- 

 lated by ordinary me- 

 thod) 



Litter basis 



(calculated from Yule's 

 formula) 



Litter basis 



(from Kellogg 's 

 mula) 



for- 



[ Male 

 \ Female 



Male 

 Female 



Male 

 Female 



/ Male 

 \ Female 



18.5'' 

 15.3" 



7.4 

 10.4 



8.1 

 9.3 



8.5 

 9.0 



* For net body weight. 

 ** For gross body weight, larger series. 



TABLE 142 

 {Coefficients of variation in organ weights, albino rat at different ages, 

 according to mean values in the last column (Jackson, '12) 



Arranged 



Brain 



Eyeballs 



Head 



Total body 



Lungs 



Kidneys 



Heart 



Liver 



Suprarenals 



Testes 



Thymus 



Spleen 



Intestinal canal 

 (plus contents) 

 Ovaries 



Average of viscera 



10 

 12 

 12 

 19 

 21 

 22 

 24 

 26 

 26 

 29 

 34 

 34 



35 



43 



25 



