922.] 



P. C. Mahalanobis : Analysis of Stature. 



77 



groups is this. My purpose is to compare the Anglo-Indian 

 Variability with the general average Variability of other races. 

 If the Coefficient of Variation for the same race is given several 

 times over under different age-groups, too much weight will 

 obviously be given to this particular race I also omit Dinka. 1 



Distribution oj Coefficients of Variation of 107 non-Caste Samples. 



Group 



Be- 

 yond 



i-8o 



i-8o 



to 

 1-90 



1-90 

 to 



2 -co 



2*00 



to 



2*IO 



2 TO 



to 



2*20 



2*20 



to 



2'30 



2-30 



to 



2-40 



2-40 

 to 



2-50 



2-50 



to 



2 60 



2-60 



to 



270 



Frequency . . 



i 











I 



O 



O 



1 







2 



I 



Group 



-2 "SO 



-2-90 



-3 'Co 



-vio 







-3"20 



-3-30 



-3*40 



-3-5o 



-360 



-370 



Frequency . . 



4 



3 



3 



8 



4 



3 



5 



6 



t8 



9 



Group 



-3 8o 



-390 



-4-00 



-4- IO 



-4-20 



-4'30 



-4-40 



-4-60 



-4-80 



-5-00 



Frequency . . 



7 



8 



9 



1 



5 



4 



1 



1 



1 



1 



Grouping in units of ' 1, I find 



/x 2 rr 28*99 60 64, 



Thus 



H= -5o'77 00 II, 



i\ = 3252-08 7371 

 0i = "10573 and 



ft = 3-868 



Curve is of Type IV, but to a first approximation we can 



apply the fi normal ' ' curve of errors. 



Mean Coefficient of Variation (107 samples) =3 5353 ±'0348 

 Standard Deviation of Coefficient of Variation = '5385 ±"0245 

 The Mean Value is slightly lower than the one found earlier. 



This is due to the fact that I have omitted the Dinka group here. 



If we include the Dinka group, the Mean Value would be raised 



to 3*553 which compares favourable' with the value 3*570, a 



difference of '035 only. 



Anglo-Indian Coefficient of Variation = 4*0672 

 Mean Coefficient of Variation =3'5353 



Anglo-Indian Difference 



= -53I9- 



_D 



a 



5319 



From Biometric Table II, 



= -988 

 5385 * 



|(i + a)= 83 84 217 

 |(i - «) = -i6 15 7^Z 



J Sec discussion on p. 62. 



