The Use of Extreme Groups to Test for the Presence of a Relationship  

Oleh:

Feldt, Leonard S.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 26 no. 3 (Sep. 1961), page 307-316.
Topik: Optimal Definition of Extreme Groups; Comparison of Difference and Correlation Approaches; Estimating the Correlation from Extreme Group Statistics
Fulltext: 2603_1006.pdf (445.75KB)

Isi artikel

Experimenters in psychology frequently investigate the relationship between two variables by selecting extreme groups on the first measure and comparing their mean scores on the second. This paper considers the efficacy of this procedure from the criterion of the power of the statistical tests. Optimal cutting points for the extreme groups are defined, and the power of the difference approach is compared to that of significance tests for the productmoment correlation coefficient.

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