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The purpose of this study was to determine whether or not the Ego State Questionnaire-Revised (ESQ-R) had acceptable construct validity (actually measured the five functional ego states) and acceptable reliability (consistently and dependably measured the five functional ego states) using factor analysis (a statistical method that identifies test items that measure the same thing) and split-half reliability (a correlation between participants' scores on two halves of a single test instrument). The ESQ-R is a 40-item experimenter-constructed instrument that measures the strength of the five functional ego states and consists of the 40 items retained from a factor analysis of 60 items described in this study. Split-half reliability coefficients utilizing Cronbach's alpha for each of the five scales (functional ego states) of the 40-items retained on the ESQ-R ranged from .69 to .83. Split-half reliability for the entire ESQ-R was .80. A second factor analysis on the 40 items retained on the ESQ-R accounted for 43.66% of the item variance. Another confirming factor analysis on the 40-item ESQ-R using a new sample is recommended. The ESQ-R can be used to measure ego states or changes in ego states during therapy, training, or education.

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Donald A. Loffredo

Donald Loffredo, Ed.D., is a licensed psychologist and an associate professor of psychology at the University of Houston-Victoria. He received a B.A. in psychology from the University of Rhode Island, an M.A. in agency counseling from Rhode Island College, and an Ed.D. in counseling psychology from the University of Houston-University Park.

Rick Harrington

Rick Harrington, Ph.D., is a licensed psychologist and professor of psychology at the University of Houston-Victoria. He received his B.A. in psychology from the University of Texas, a Ph.D. in social psychology and psychophysiology from the University of Texas at Arlington, and completed a postdoctoral fellowship in behavioral medicine/social psychology at the University of Houston.

Martin K. Munoz

Martin K. Munoz, Ed.D., is an assistant professor of education/counseling at the University of Houston-Victoria. He received his B.A. in general studies from Adam State College, an M.A. in agency counseling, and an Ed.D. in counselor education from the University of Northern Colorado.

Laura Ruth Knowles

Laura Ruth Knowles, B.B.A., is a graduate counseling psychology student at the University of Houston-Victoria. She received a B.B.A. in marketing and management from Texas A&M University. She currently is employed as a degree plan counselor in the School of Business at the University of Houston-Victoria.
 

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