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

VALIDATION OF MEASURING INSTRUMENTS 179 sented by a pair of ranks—the relative positions assigned those measurements in the two series. 2. Obtain the difference between the two ranks assigned each case. 3. Square each of these differences. The squares are read from Table 3. Note that the decimals may be omitted from the squares without appreciable error. 4. Add these squares of the differences. This sum (TD?) is to be found in the body of Table 4. 5. Refer in Table 4 to the proper column for the number of cases used (NV). Thus, if 21 cases were ranked, use the second column on page 253. Run down this column until you find the entry nearest the obtained ZD2. 6. Read the entry in this same line at either side of the page (first or last column). This entry is p. The desired coefficient of correlation (7) may be obtained from Table s. Rank Rank Differ- Example: 21 cases are arranged in rank Sones’ || Sores Sod order for two variables; the sum of the I 11 squares of the differences in the correspond- » 26 ing ranks is found to be 531 (five-tenths ‘ A is disregarded). : fr Refer to the second column on page 253, k run down to the entry which most nearly equals 531, that is, 524, and read beside it the value of p, .66. The corresponding 2 value of 7 (.68) is found in Table 5. I 3 Note: (a) If the obtained =D? is nearly L I i midway between two entries, use the p fall- t. 1 ing between the p's corresponding to the ‘ 5: two entries. (If the =D? in the example 2s were 540, p would be .65.) I 21Y, l (b) For ZD? greater than those corre- I ‘ sponding to p=0 (i. e. in case of negative [ I 9 correlation) subtract the obtained =D? 1 10 5a from the entry in that column correspond- [ 21 ing to p= —1.00. Find the p correspond- 2 1:5 5 ing to this number obtained by subtraction. z . Si With a negative sign prefixed, this is the desired ». ELC = 3531.5 The fourfold table method (tetrachoric correlation) as- sumes that both variables are continuous but takes account only of position above or below the measure of central ten- dency in each series. The fourfold table corresponds to the scatter diagram divided into four compartments by the

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