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

Collection:: Economics Books

I EMPLOYMENT PSYCHOLOGY which are below the assumed mean are prefaced by a negative sign. Record in columns 16 and 17. 10. ZX,,s is the sum of the numbers to the right of the assumed mean in row NV. 11. ZX, is the sum of the numbers to the left of the assumed mean in row NV. 12. Add the above two figures algebraically and record after Xx. 13. Add the numbers in row P on both sides of the assumed mean and record this after 2x2. 14. Perform the operations for the y variable analogous to those in 10, 11, 12, and 13, above, and record in the appropriate places on the form. 15. Values of Zxy,,, and Zxy,., are obtained by adding col- umns 17 and 16 respectively. Zxy is the algebraic sum of these two values. 16. N is the number of cases and is obtained from either col- umn 8 or row L. 17. The remaining operations are self-explanatory. Hull (78) and Dodd (45) have constructed calculating machines to aid in computing correlation coefficients. With practice it becomes possible to estimate 7 roughly from the scatter diagram, which is a graphic presentation of the measurements of all persons measured in each of the two variables whose relationship is being examined. In a scatter diagram the test scores are usually plotted as abscis- sae and the criterion as ordinates. The product-moment formula may take the form: ly (13) v= Siz. ye With the use of this form it is not necessary to make a scat- ter diagram (157, p. 274). Correlation may also be computed without scatter dia- gram if gross measures or raw scores are used instead of deviations from the mean (86, p. 164): >XY-(CX)(ZY)/N (19) r= SGN VV (2V)N =X:—(2X)?/N- VI? —(2Y)*/N

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