ERIC Number: EJ833764
Record Type: Journal
Publication Date: 2009-Jun
Abstractor: As Provided
Reference Count: 0
Assessing Longitudinal Change: Adjustment for Regression to the Mean Effects
Rocconi, Louis M.; Ethington, Corinna A.
Research in Higher Education, v50 n4 p368-376 Jun 2009
Pascarella (J Coll Stud Dev 47:508-520, 2006) has called for an increase in use of longitudinal data with pretest-posttest design when studying effects on college students. However, such designs that use multiple measures to document change are vulnerable to an important threat to internal validity, regression to the mean. Herein, we discuss a brief history of regression to the mean and illustrate a straightforward procedure to make adjustments to initial pretest scores for regression to the mean effects utilizing a method developed by Roberts (in: G. Echternacht (Guest ed.) New directions for testing and measurement, 1980). Analyses are shown with both unadjusted and adjusted pretest scores, illustrating dramatic differences in conclusions about whether students change across time.
Descriptors: Pretests Posttests, Scores, College Students, Longitudinal Studies, Research Methodology, Research Design, Validity, Change, Measurement, Regression (Statistics)
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A