A Method for Approximating The Average Intercorrelation coefficient by Correlating The Parts with The Sum of The Parts  

Oleh:

Babitz, Milton ; Keys, Noel

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 5 no. 4 (Dec. 1940), page 283-288.
Topik: Derivation of the Formula; Empirical Validation; Derivation of Correction Factor
Fulltext: A Method for Approximating The Average Intercorrelation coefficient by Correlating The Parts with The Sum of The Parts.pdf (186.1KB)

Isi artikel

It is noted that the average inter-item correlation, which represents the internal consistency of a test, yields a unique estimate of test reliability. A close approximation to this average is given by a formula which requires the correlation of each item with the total score and the standard deviation of each item. The formula is especially useful in those instances where the number of items is small and where the variation in item sigmas should not be neglected.

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