The Upper and Lower Twenty-Seven Per Cent Rule  

Oleh:

Cureton, Edward E.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 22 no. 3 (Sep. 1957), page 293-296.
Topik: Rule; Criterion Scores; Derivation
Fulltext: Vol 22 No. 3 Sept 1957 p.293-296.pdf (162.2KB)

Isi artikel

A simplified re-derivation of the formula underlying the rule is presented, followed by a derivation of the comparable rule for the unitrectangular distribution, which turns out to be a 33-per cent rule. Critical comments are offered concerning two assumptions: normality of the score distribution and equality of mean standard errors of measurement in the high and low groups.

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