Brief Research Report: A User Friendly Effect Size--When Normality Matters

Autor/inn/en	Waterbury, Glenn Thomas; DeMars, Christine E.
Titel	Brief Research Report: A User Friendly Effect Size--When Normality Matters
Quelle	In: Journal of Experimental Education, 87 (2019) 2, S.260-268 (9 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0022-0973
DOI	10.1080/00220973.2018.1434757
Schlagwörter	Effect Size; Robustness (Statistics); Simulation; Research Methodology; Computation; Statistical Bias; Statistical Distributions + Suchen Sie Ihr Suchwort? Widerstandsfähigkeit; Simulation program; Simulationsprogramm; Research method; Forschungsmethode; Wahrscheinlichkeitsverteilung
Abstract	There is a need for effect sizes that are readily interpretable by a broad audience. One index that might fill this need is [pi], which represents the proportion of scores in one group that exceed the mean of another group. The robustness of estimates of [pi] to violations of normality had not been explored. Using simulated data, three estimates of [pi] ([pi-hat][subscript direct], r, and r[subscript robust]) were studied under varying conditions of sample size, distribution shape, and group mean difference. This study demonstrated that r and r[subscript robust] were biased estimates of [pi] when data were nonnormal. We recommend that neither be used in estimating [pi] unless data are normally distributed. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01