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:: XIII. Validation of the measuring instruments

Collection:: Economics Books

VALIDATION OF MEASURING INSTRUMEN TS 169 this formula should not be used in place of the uncorrected value in predicting one variable from another. Better correction for attenuation is obtained by correlat- ing both sets of test scores and criterion records. The formula then becomes a Mri Still more refined correction is possible if each set of test scores Is correlated with each of the sets of criterion records (233, p. 213): (£) Toy w= Vr Tog, Tra - Pro ® Try V Tez, * Ty, Validity. Each test or other measuring instrument must be evaluated by making a statistical comparison between the scores of the subjects and their vocational accomplishment. The concomitance of these two variables can be determined accurately and stated mathematically. From this observed relationship may then be inferred the predictive value of the tests under similar future conditions. In the practical situa- tion the test score is always the known variable, and the vocational success the predicted variable. The reason for the relationship between the two variables is a matter of interesting speculation. Unless special circum- stances or weaknesses in the experiment allow extraneous forces to account for the relationship, it may be assumed with reasonable assurance that the relation between the two variables is caused by some common ability or group of abil- ities involved in both performances. Statistical devices for determining the relationship be- tween test and criterion are of two sorts. One of these de- vices, used when the criterion or both the criterion and the test scores are discrete variables, tells how much the differ- ent classes of vocational success, represented by their central tendencies, differ in test performance. Such a device gives an expression of the significance of the difference found be- )

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