460 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



"Poorest" 

 INF 



"Poorest 9 

 F.A. 



5ta»d«rd 



HCO? 



INF. 



'Best" 

 JNF. 



"Bes^ 

 FA. 



KCjO* 



F.A. 



Fig. 1. — Comparison of alpha tests according to rank order of each test in differentiating between certain military groups. The arrowhead 

 shows the particular pair of military groups (named at the top of the diagram) differentiated between by a particular test (listed at the left of the 

 diagram); the number on the arrows give the rank order of the particular test as a differentiator between these two groups. The number in the 

 circle is the rank order based on the x ' criterion; the number in the rectangle is the rank order based upon the ratio of the difference to its probable 

 error. See text for discussion of these criteria. 



