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Direct linkKratochwill, Thomas R.; Levin, Joel R. – Psychological Methods, 2010
In recent years, single-case designs have increasingly been used to establish an empirical basis for evidence-based interventions and techniques in a variety of disciplines, including psychology and education. Although traditional single-case designs have typically not met the criteria for a randomized controlled trial relative to conventional…
Descriptors: Research Design, Intervention, Evidence, Educational Research
Hubert, Lawrence J.; Levin, Joel R. – Journal of Verbal Learning and Verbal Behavior, 1976
A statistical framework is suggested for comparing a single partition of an object set to a second partition posited a priori or possibly to a more general proximity matrix. (Author/RM)
Descriptors: Evaluation Methods, Language Research, Measurement Techniques, Research Methodology
Peer reviewedLevin, Joel R.; Robinson, Daniel H. – Educational Researcher, 2000
Supports a two-step approach to the estimation and discussion of effect sizes, making a distinction between single-study decision-oriented research and multiple-study synthesis. Introduces and illustrates the concept of "conclusion coherence." (Author/SLD)
Descriptors: Effect Size, Evaluation Methods, Research Methodology, Sample Size
Download full textLevin, Joel R.; Marascuilo, Leonard A. – 1971
Marascuilo and Levin's (1970) notion of Type IV errors is extended, with respect to the interpretation of interactions in analysis of variance (ANOVA) designs. To help clarity what an interaction is and what it is not, in terms of the ANOVA model, the following points are made: (i) interactions should be thought of as linear contrasts involving…
Descriptors: Analysis of Variance, Behavioral Science Research, Evaluation Methods, Hypothesis Testing
Onwuegbuzie, Anthony J.; Levin, Joel R.; Leech, Nancy L. – Learning Disabilities: A Contemporary Journal, 2003
Because of criticisms leveled at statistical hypothesis testing, some researchers have argued that measures of effect size should replace the significance-testing practice. We contend that although effect-size measures have logical appeal, they are also associated with a number of limitations that may result in problematic interpretations of them…
Descriptors: Intervals, Psychological Studies, Learning Disabilities, Testing
