no. 2.] PSYCHOLOGICAL EXAMINING IN THE UNITED STATES ARMY. 411 



V. Right to left: Weights (3-15 grams). 



VI. Comprehension (VI); Aesthetic comparison. 



VII. Comprehension (VIII); Missing parts. 



VIII. Counting backward; Making change. 



IX. Date; comprehension (X). 



X. Absurdities; Arranging weights. 



XI. Sixty words. 



Considering only the mental ages as far as 11 years, the median deviation of short scale 

 from complete scale was 0.3 year. "If a subject passes all the tests it is practically certain 

 that his mental age is above 10.5 years." 



A Camp Upton report on 100 men whose mental ages were computed both by the 4 tests 



per year scale and the above abbreviation showed a correlation of 0.955 (Pearson) between 



long and short scales. The short scale showed a median deviation of 3 months (.25 year) from 



the long scale. 



Section 5.— Abbreviation of the Yerkes-Bridges point scale. 



The data for the abbreviation of the point scale consisted of 479 records. Of these 186 

 came from Camp Greenleaf, about 200 from Camp Meade, and the remainder from Camps 

 Travis and Stewart. The distribution of these cases according to total score was as follows: 



The diagnostic value of the separate tests was determined by plotting a correlation array 

 for score in each test against score on the whole scale. These are shown in Table 73. The testa 

 may be classified as follows: 



EXCELLENT TO GOOD. 



Test 15. Comprehension. 



Test 7. Reaction to pictures. 



Test 17. Absurdities. 



Test 19. Abstract words. 



Test 20. Analogies. 



Test 18. Dissected sentences. 

 Test 13. Naming words. 

 Test 12. Square and diamond. 

 Test 10. Definitions, concrete terms. 

 Test 9. Comparison of objects. 



Test 2. Missing parts. 

 Test 4. Memory for digits. 

 Test 14. Three words. 



GOOD TO FAIR. 



Test 16. Memory for designs. 

 Test 6. Memory for sentences. 



Test 1. Chooses prettier. 

 Test 3. Lines and weights. 

 Test 5. Counting 20-1. 



Test 8. Arranging weights. 

 Test 11. Suggestibility. 



The average score for each test was found and reduced to a percentage value of the maximum 

 possible score on that test. The order of difficulty of the tests based upon this percentage 

 value is given in Table 69. This order differs markedly from the order for children determined 

 in the same way and represented by the present order of tests in the scale. 



Table 69. — Point scale tests in order of difficulty for white recruits. 



Tests. 



1. Aesthetic comparison and judgment 



3. Comparison of lines and weights 



*2. Missing parts 



5. Counting backward 



*9. Comparison of objects 



8. Arranging weights 



*12. Copying square and diamond 



7 . Reaction to B inet pictures 



1 1 . Resistance to suggestion 



*10. Definitions of concrete terms 



Average 

 score. 



2.87 

 2.80 

 3.57 

 3.14 

 4.40 

 1.45 

 2.78 

 6.02 

 2.05 

 4.66 



Ratio of 



average to 



possible 



score. 



95.7 

 93.3 

 89.2 

 78.5 

 73.3 

 72.5 

 69.5 

 66.9 

 64.2 

 58 3 



Tests. 



*4. Memory span for digits 



*15. Comprehension of questions . . . 

 6. Repetition of sentences 



13. Free association 



*17. Criticism of absurd statements 



19. Definition of abstract terms. . . 



14. Three words in one sentence . . 

 *16. Drawing designs from memory 

 *20. Analogies 



18. Construction of sentences 



