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.
Velicer, Wayne F & Stevenson, John F. (1978). The relation between item format and the structure of the Eysenck Personality Inventory. Applied Psychological Measurement, 2, 293-304. doi:10.1177/014662167800200210
Velicer, Wayne F.; Stevenson, John F..
The relation between item format and the structure of the Eysenck Personality Inventory.
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