The Idea Inventory proposed as a measure of irrational thinking as defined by rational-emotive theory, was administered to two independent samples of college students on two occasions. Sample 1 (n = 135) provided a test-retest interval of 4 wk.; Sample 2 (n = 114), an interval of 4 to 6 wk. Indices of temporal stability, test-retest reliability coefficients (product-moment) and group changes over time, indicated satisfactory reliability for the Idea Inventory.
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