Psychometric Attributes of the Psychological Effectiveness Scale

Preliminary studies done by Poe on the Psychological Effectiveness Scale (PES), which he introduced, indicate that when it is administered to college students, the instrument has considerable validity and internal consistency reliability. The aim of the present study was to explore further the psychometric attributes of the PES in Ss of a different socioeconomic status. One hundred Ss on a methadone maintenance program were asked to rate themselves and two abstract concepts: "abnormal person" and "typical person." The findings included coefficient alphas in the .90s, high average item-correlation (total minus item), and a significant difference between the means of the three ratings. These findings confirm that the PES has sufficient reliability and construct validity to justify further use.