Browsing by Author "Velicer, Wayne F."

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    Item format and the structure of the Personal Orientation Inventory
    (1984) Velicer, Wayne F.; DiClemente, Carlo C.; Corriveau, Donald P.
    Two versions of the Personal Orientation Inventory were administered to 317 subjects. One version employed the standard two-choice response format. The other version used a six-choice response format. The purpose of this study was (1) to determine if a multiple- response format resulted in improved psychometric properties, (2) to compare the component structure of the two versions, and (3) to compare the empirically derived scales with the theoretically defined scales. The results showed a slight improvement for the multiple- response format, but with poorly defined component patterns. The change in format resulted in a change in component structure. The components derived from both versions did not correspond to the theoretical scales. An analysis indicated that the only well-defined component from either response format could be interpreted as measuring social desirability responding rather than measuring content. A follow-up questionnaire indicated greater subject acceptance of the six-choice version.
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    The relation between item format and the structure of the Eysenck Personality Inventory
    (1978) Velicer, Wayne F.; Stevenson, John F.
    A Likert seven-choice response format for personality inventories allows finer distinctions by subjects than the traditional two-choice format. The Eysenck Personality Inventory was employed in the present study to test the hypothesis that use of the expanded format would result in a clearer and more accurate indication of test structure. The subjects, volunteers in a psychology course, took the standard two-choice version of the EPI and a seven-choice version one week apart, with the order counter-balanced. A principal components analysis with a varimax rotation yielded two components for the two-choice format, clearly identifiable as Eysenck’s "Neuroticism" and "Extraversion" which together accounted for 18% of the variance. The seven-choice version resulted in six components accounting for 46% of the variance. The expanded format suggested inadequacies in the structure of the EPI, defined the factor structure more clearly, and explained a greater proportion of the variance. It thus demonstrated the apparent advantages of the multiple-response format for scale construction.