Use of True-Score Theory to Predict Moments of Univariate and Bivariate Observed-Score Distributions  

Oleh:

Lord, Frederic M.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 25 no. 4 (Dec. 1960), page 325-342.
Topik: Estimating the Moments of Scores on a Lengthened or Shortened Test; Estimating the Cumulants of a Lengthened Test; Estimating the Cumulants of the Scatterplot Between Parallel Forms
Fulltext: 2504_1004.pdf (654.08KB)

Isi artikel

Formulas are derived for using the available item statistics and score statistics on a test to estimate the moments of the score distribution of a lengthened (or shortened) form of the same test. Other formulas are derived for estimating the bivariate moments of the scatterplot between two parallel test forms using only the data available on either form alone. An empirical study is made showing in each case satisfactory agreement between the theoretical values predicted from the formulas and the values actually observed. These results suggest the utility of the true-score model used in deriving the formulas.

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