186 
0)1 Criminal Anthropometry 
TABLE 4. 
1306 Criminals. 
Coefficient of Correlation 
Head Length and Head Breadth 
Head Breadth and Height 
L. M. Finger and Height 
•3958 + -0157 
•1973 + ^0179 
•6682 + ^0103 
To compare the results thus obtained for the two sets of 3000 and 1306, we 
will compare the absolute difference of their standard deviations, means, and 
coefficients of correlation with the square root of the sums of the squares of the 
probable errors. Let us call the difference D, the square root in question S, the 
coefficient of correlation r ; and to show the form of the calculation we will take 
the standard deviation of Head Length as an example. For the sake of keeping 
as many significant figures as possible, we will use the millimetre as our unit. 
S.D. of 1306 criminals is 6-00247 ± -07922 
3000 „ 6 04593 ± -05265 
D= -04346 
{(-07922)^ + (-05265)''}^ = ,Sf= -09512 
Thus it appears that D is less than one-half of S. 
Collecting all our results together, we have the following tables : 
TABLE 5. 
1306 and 3000 Criminals. 
Standard Deviation 
Mean 
D 
S 
D 
S 
Head Length ... 
Head Breadth 
Height 
L. M. Finger 
•04346 
•11840 
•04963 
•02758 
•09512 
•08059 
•04072 
•08632 
•22535 
•13922 
•11618 
•22941 
•13451 
•11397 
•05759 
•12208 
