Case Studies for Evaluating Statistical Significance in Group Designs

Timothy J. Meline · John F. Schmitt

63 citations0/0 files storedAmerican Journal of Speech-Language Pathology

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Meta-analysis and systematic reviews Statistical Methods in Epidemiology Psychology Research and Bibliometrics

Abstract

We present a tutorial for evaluating statistical significance in research reports when t, F , or X 2 is the primary statistic. The article is intended to help speech-language pathologists evaluate research conclusions so that they can decide if the result is meaningful for their practice. To this end, we explain the value of "practical significance" and describe the metric known as "effect size." The use of effect-size measures is illustrated in a variety of case studies that are drawn from the communication disorders literature.

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1974Foundations of Behavioral Research 1968Statistical significance in psychological research.1996Publication Manual of the American Psychological Association (4th ed.).1982A simple, general purpose display of magnitude of experimental effect.19779: Integrating Findings: The Meta-Analysis of Research 1992Morphological Deficits in Children With Specific Language Impairment: The Status of Features in the Underlying Grammar 1968Magnitude of experimental effect and a table for its rapid estimation.1993Two Approaches to the Facilitation of Grammar in Children With Language Impairment

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