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:: XIV. Validation of the measuring instruments (concluded)

Collection:: Economics Books

VALIDATION OF MEASURING INSTRUMENTS 189 Opinions differ on interpreting the significance of the size of the correlation coefficient. Some authorities contend for a correlation of .60, while others claim that even if the cor- relation is as low as .23 it indicates an important relation- ship between the two variables. Rugg (157, p. 256) de- scribes the significance of different amounts of correlation in the following terms: less than .I5 or .20.....negligible or indifferent .I5 or .20 to .35 or .40.....present but low .35 or .40 to .50 or .60.....markedly present above .60 or .70.....high One cannot generalize about the size of the correlation coefficient in this way. The coefficient must be interpreted in each instance in terms of the total situation, the nature of the group, the thing measured, the reliability of each vari- able, and the size of the probable error of the coefficient. The following are some of the factors which account for low correlation between variables: Actual absence of relation; Restriction in the range of either variable; Failure to keep a third variable constant; Inaccuracy of the original measures; Loaded sampling. In practical use an analysis of the distribution of cases in the scatter diagram may reveal far more significant in- formation than the correlation coefficient. If there is any correlation at all, the scatter diagram should be analyzed in order to set off critical scores and critical sections. We have given consideration to the various methods whereby the extent of the general relationships between measurements of abilities and the criteria of vocational accomplishment are established. In the next chapter we shall deal with the methods of determining the probability of vocational success implied by definite test scores.

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