Results 211 to 220 of about 37,466 (251)
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The Effect of Screening on Some Pretest-Posttest Test Variances
Biometrics, 1991The clinical trial design in which the endpoint is measured both at baseline and at the end of the study is used in a variety of situations. For two-group designs, test such as the t test or analysis of covariance are commonly used to evaluate treatment efficacy.
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Within-Subject Comparison of Changes in a Pretest-Posttest Design
Applied Psychological Measurement, 2010The authors propose a method to compare the influence of a treatment on different properties within subjects. The properties are measured by several Likert-type—scaled items. The results show that many existing approaches, such as repeated measurement analysis of variance on sum and mean scores, a linear partial credit model, and a graded response ...
Christian Hennig +2 more
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Some Unexamined Aspects of Analysis of Covariance in Pretest–Posttest Studies
Biometrics, 2004Summary The use of an analysis of covariance (ANCOVA) model in a pretest–posttest setting deserves to be studied separately from its use in other (non‐pretest–posttest) settings. For pretest–posttest studies, the following points are made in this article: (a) If the familiar change from baseline model accurately describes the data‐generating mechanism ...
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Resolution of a Regression Paradox in Pretest‐Posttest Designs
Journal of Educational Measurement, 1992Regression to the mean (RTM) of individuals is the tendency for extreme individuals to become less extreme on remeasurement; RTM of group means describes this same tendency among group means. Under the classical test model, in pretest‐posttest designs where subjects are selected on the basis of extreme values at the pretest, RTM of group means will ...
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Statistical Power for Nonequivalent Pretest-Posttest Designs
Evaluation Review, 2001Nonequivalent controlled pretest-posttest designs are central to evaluation science, yet no practical and unified approach for estimating power in the two most widely used analytic approaches to these designs exists. This article fills the gap by presenting and comparing useful, unified power formulas for ANCOVA and change-score analyses, indicating ...
J M, Oakes, H A, Feldman
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Optimal allocation of assessment time in randomized pretest^posttest designs.
Psychological Bulletin, 1994The widely used pretest-posttest design traditionally consists of a pretest and a posttest of equal lengths. However, greater statistical power can usually be achieved by using a posttest that is somewhat longer than the pretest. This article provides a method for calculating the optimal allocation of pretest and posttest assessment units so as to ...
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Further Comparative Analyses of Pretest-Posttest Research Designs
The American Statistician, 1983Abstract An alternative method of analysis for randomized pretest-posttest experiments is proposed. It yields treatment contrasts identical to those from ordinary analysis of covariance and also provides adjusted gain scores for each treatment group.
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Can Training Enhance Public Employees’ Public Service Motivation? A Pretest–Posttest Design
Review of Public Personnel Administration, 2021Chung-An Chen, , Don-Yun Chen
exaly
Testing for Experimental Effects in the Pretest-Posttest Design
Nursing Research, 1984M J, Egger, J R, Miller
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