The upper and lower twenty-seven per cent rule |
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Authors: | Edward E. Cureton |
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Affiliation: | (1) University of Tennessee, USA |
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Abstract: | 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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