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MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV. 



time checked to the credit below moves checked and records the sum in the column marked "score," as above. In 

 test 8 time is checked and the credit for time added to the credit for success, etc., as before. The abbreviation T. L. 

 in these tests means "time limit"; and this space is checked only when subject is actually stopped before the test 

 or part of the test is completed. 



In test 3, examiner records the response only when it is incorrect; but always writes + or — in the proper column. 

 In test 10, the number on the back of the block selected for a given picture is written below the number of the pic- 

 ture, and the credit for that part is written in the next space below. If no block is selected for any given picture, 

 examiner leaves that space blank. Tests 6 and 7 require no explanation. 



The score for each part of tests 2, 4, 5, 8, and 9 are written in the column marked "score"; and then these part 

 scores are totalled below the heavy line, except in test 2. where the total for the two parts is merely written at the foot 

 of the space for score. In all other tests only the total score for the test is written in the "score" column. 



(d) DIRECTIONS FOR WEIGHTING PERFORMANCE-SCALE SCORES. 



The raw score for each of the 10 tests is converted into a weighted or equalized score, which is entered on the 

 performance-scale record blank and on the psychological record card in the column headed: "Wtd. score." This 

 weighted score is obtained by means of the accompanying table. In the table all the possible raw scores for each 

 test are listed in columns bearing the number of the test. The weighted scores corresponding are listed in the col- 

 umns under the letter W at either side of the page. For example, to convert a raw score, in test 1, into a weighted 

 score, look at the column under figure 1, find the raw score, and take the score in either column W which is on the 

 same line. Thus, the weighted score corresponding to the raw score 19, in test 1, is 13. The weighted score corre- 

 sponding to the raw score 35, in test 7, is 15, etc. 



(e) AN ABBREVIATED PERFORMANCE SCALE. 



If time does not permit the giving of the complete performance scale, a short scale selected from tests 1, 2, 3, 4, 6, 

 7, and 8 may be used. These tests must be given in the following order: 7, 6, 2, 4, 8, 1, 3 (or 3, 1). After each test 

 is given examiner should compute the weighted score obtained by subject up to that point; and he may discontinue 

 the examination after the first test, if the score is 14 or more; after the second, if it is 22; after the third, if it is 27; and 

 after the fourth, if it is 32. The fifth test should be given if the score on four tests is less than 32; but only very rarely 

 need more than five tests be used. 



If subject is absolutely illiterate (whether American or foreign born), examiner should begin with test 6 instead 

 of 7, and follow the same procedure. 



If the examination is discontinued after the first test, subject should be rated D (C — , if the score is 21 or more) 

 and as a rule recommended for regular service. If two or more tests are given, a final score should be obtained by finding 

 the average for the tests actually given and multiplying by 10. The letter rating for this score can then be read from 

 the table of norms for the short scale. If eight or more tests are given, the norms for the long scale should be used. 



