VI. CORRELATIONS IN LEARNING RECORDS 



VARIOUS correlations have been calculated for performance in one 

 task with performance in another, and between groups of trials 

 within a single task. The correlation have all been positive, varying 

 from 0.11 to 0.85 as described below. A complete list of the correla- 

 tions is given in Table VIII. The Pearson formula, 



TABLE VIII 

 KESUI/TS OF CORRELATIONS 



was used for the correlations numbered in the table as 1, 2, 6 and 7. 

 Because the remaining correlations, 3, 4, 5 and 8 were made between 

 two groups both from asymmetrical distributions, the ranking method 

 was used with the following formula: 



r = 1 - 



6SD 2 

 n(n 2 - 



The ranking method was employed so that undue weight would not 

 be given to the few extreme cases in the skewed distributions. This 

 disadvantage did not occur in the correlations made, between time 

 and error, and performance at the beginning and end of the tests, 

 so in these cases the Pearson formula was used. 



The correlation between the time in the initial learning period 

 in the maze test with the errors made during that performance 



23 



