A 30-item questionnaire comprised of Rotter's I-E scale (minus 6 filler items), 6 independent questions derived from the I-E scale, and 1 independent question was administered to 93 college students. Common factor analysis assessed the dimensionality of the I-E scale, and 4 factors were identified. The relationship between the measures of locus of control was assessed, yielding evidence that the single-item measure is a valid alternative brief measure of locus of control.
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