Sampling Fluctuations Resulting from the Sampling of Test Items  

Oleh:

Lord, Frederic M.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 20 no. 1 (Mar. 1955), page 1-22.
Topik: Sampling Fluctuations; Test Items; Illustrative Examples; Standard Errors; Measurement; Test Reliability; Certain Standard Formulas; Test Statistics; Expected Values; Standard Errors
Fulltext: Vol 20 No.1 March 1955 p.1-22.pdf (862.54KB)

Isi artikel

Sampling fluctuations resulting from the sampling of test items rather than of examinees are discussed. It is shown that the Kuder-Richardson reliability coefficients actually are measures of this type of sampling fluctuation. Formulas for certain standard errors are derived; in particular, a simple formula is given for the standard error of measurement of an individual examinee's score. A common misapplication of the Wilks-Votaw criterion for parallel tests is pointed out. It is shown that the Kuder-Richardson formula-21 reliability coefficient should be used instead of the formula-20 coefficient in certain common practical situations.

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