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

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Title:: VIII. Psychological tests (concluded)

Collection:: Economics Books

PSYCHOLOGICAL TESTS the point where they refuse to continue, whereas those who are able to complete these difficult problems find the sailing smoother with the problems which follow. The resulting differences in score exaggerate the real differences in ability. If the items are of equal difficulty, speed is measured. If they are in order of increasing difficulty, then not only speed but level of ability is measured. LENGTH OF TEST The test should provide a sufficient sampling of the ability to yield a reliable measure. The law of diminishing returns applies to the length of a test. The first few items are the most valuable. Additional items increase the reliability of the test, but in diminishing proportion. It is better, how- ever, to err on the side of having too many items than too few. The validity of each item may eventually be deter- mined and the test reduced to include only those items which show the greatest vocational predictive value. The test may also sometimes be shortened after correlat- ing scores made in a part of it with scores made in the whole test. Any part of the test which correlates more than .95 with the whole test may be used in place of it. TIME LIMITS A time limit is not essential to a test, since it may be scored on accuracy alone. If accuracy is the variable which the test aims to measure, the time limit may be set so liberally that all but a very few (about 5% or 10%) are able to complete the task. But there is no point in allowing a person to fumble over a task indefinitely when it is obvious that he will not be able to complete it satisfactorily. A time limit which is set for convenience aims to meet this situation, and not to measure speed. On the other hand, if it is necessary to measure speed, the IX

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