Purpose: Personality inventory.
Population: College and adults.
Scores: 15 scores.
Time: (40-55) minutes.
Author: Allen L. Edwards.
Publisher: The Psychological Corporation.
Description: The Edwards Personal Preference Schedule (EPPS) is a forced choice, objective, non-projective personality inventory, derived from the theory of H. A. Murray, which measures the rating of individuals in fifteen normal needs or motives. On the EPPS there are nine statements used for each scale. Social Desirability ratings have been done for each item, and the pairing of items attempts to match items of approximately equal social desirability. Fifteen pairs of items are repeated twice for the consistency scale.
Scoring: The EPPS consists of 15 scales: achievement, deference, order, exhibition, autonomy, affiliation, interception, succorance, dominance, abasement, nurturance, change, endurance, heterosexuality, and aggression.
Reliability: Split-half reliability coefficients, or coefficients of internal consistency for 1,509 students in the college normative group range from .60 to .87 with a median of .78. The author also presents test-retest stability coefficients with a one-week interval. These are based on a sample of 89 students and range from .55 to .87 with a median of .73. Other researchers have reported similar results over a three-week period, showing correlations of .55 to 87 with a median of .73.
Validity: The manual reports studies comparing the EPPS with the Guilford Martin Personality Inventory and the Taylor Manifest Anxiety Scale. Other researchers have correlated the California Psychological Inventory, the Adjective Check List, the Thematic Apperception Test, the Strong Vocational Interest Blank, and the MMPI with the EPPS. In these studies there are often statistically significant correlations among the scales of these tests and the EPPS, but the relationships are usually low-to-moderate and often are difficult for the researcher to explain.
Norms: 1,509 students in college.
Suggested Uses: Recommended primarily for instructional value and research settings.