130 PSYCHOLOGICAL METHODS OP TESTING INTELLIGENCE 



basis of their performances and also their ranking 

 according to their intelligence. So far as it has 

 proved feasible I have calculated the rank-correla- 

 tions of these lists. It must be stated that quite a 

 number of the lists had to be excluded ; some because 

 the teacher had been satisfied to present the material 

 arranged in a very few intelligence-groups, and some 

 because the necessary precautions of method had 

 plainly not been observed. Thus, there were many 

 lists that showed plainly that the rank-order for 

 school performances had been arranged first and 

 then the rank-order for intelligence had been ar- 

 ranged from it with only a very few corrections. 



TABLE XVI 

 VOLKSCHULE LIEGNITZ 



School Number Number 



The remaining lists, however, cover all the differ- 

 ent school grades. The important data are shown in 

 Table XVI. There it will be noted that in figuring 

 the correlation I left out in each class a number of 

 pupils whose age exceeded the proper limits. If we 

 leave Class Vb out of consideration for the moment, 

 the correlations are then uniformly markedly high 

 between .78 and .97 ; average without Class Vb = 

 0.88. The fact that the correlation is higher than the 



