Procedures in employment psychology

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Monograph

Identifikator:: 173623112X

URN:: urn:nbn:de:zbw-retromon-112923

Document type:: Monograph

Author:: Bingham, Walter Van Dyke http://d-nb.info/gnd/123042593; Freyd, Max

Title:: Procedures in employment psychology

Place of publication:: Chicago & New York

Publisher:: Shaw

Year of publication:: 1926

Scope:: XI, 269 S

Digitisation:: 2020

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: XVII. Prediction by combined scores

Collection:: Economics Books

PREDICTION BY COMBINED SCORES 2 scores. Another point not to be overlooked is the relative dispersion of scores in the two tests. The test with the greater standard deviation receives more weight when raw scores are added even though the range of scores in the two tests is the same. The method of adding raw scores should then ordinarily be avoided. Error due to unintentional weighting of the first sort men- tioned in the preceding paragraph may be eliminated by weighting to equalize the medians or means in the various tests. If the median score in one test is five times as great as the median score in another test, then scores in the second test should be multiplied by five. This method, however, does not take into account the relative dispersion of scores in the two tests. To do this the scores in each test should be expressed in terms of the standard deviation of scores in that test. This step reduces to the same unit of measure- ment the scores in the different tests. To express any per- son’s score in a test in terms of the standard deviation, the deviation of his score from the mean of the distribution is divided by the standard deviation of the distribution, and a plus or minus sign affixed, depending on whether his score is above or below the mean. (If the test has a negative cor- relation with the criterion, then a plus sign is affixed before a score which is below the mean, and vice versa.) The probable error of the distribution should be used as the unit measure of dispersion, if the median instead of the mean has been calculated. The individual’s total score is the algebraic sum of his scores in each of the separate tests, as thus computed. Adding percentile standings in the various tests equalizes the weights. So, too, when decile or quintile standings are added. A total score so obtained must be considered as a measure of relative standing only. The above methods assign equal weight to the various tests. Once the matter of unintentional weighting has been guarded against in this way, the proper weight to be given to each test may be determined. This weight will depend both 20%

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