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:: XVII. Prediction by combined scores

Collection:: Economics Books

XVII PREDICTION BY COMBINED SCORES Total scores based on group comparisons. Weighting critical sections. Total scores based on the establishment of correlation. Multiple correlation co- efficient and multiple regression equation. Other methods of combining scores. WHEN the predictive values of scores in the various sepa- rate tests or other measuring instruments have been de- termined, the next step is to find the predictive value of com- bined scores in all of these measuring instruments. Since the valid tests will not all forecast vocational accomplish- ment with equal accuracy, they should be properly weighted in obtaining a combined score. This combined score should yield a more accurate prediction than the score in any one particular test. Such a total score eliminates opinion based only on general impressions of the combined significance of test scores, thus retaining the principle of objectivity. Here as in the preceding chapters the methods are treated under two headings: those to be used where group com- parisons have been made, and those to be used where cor- relations have been calculated. TOTAL SCORES BASED ON GROUP COMPARISONS Tests which have been evaluated by methods of group comparison and for which critical sections have been de- termined should be combined with reference to critical sec- tions and not to raw scores. To add raw scores would in- troduce an unintentional weighting unless correction were made for differences in values of means and standard devi- ations (see pages 206 ff). It would introduce in this case an additional error, inasmuch as critical sections are fixed with- 20%

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