Effect Sizes and their Intervals: The Two-Level Repeated Measures Case

Autor/inn/en	Algina, James; Keselman, H. J.; Penfield, Randall D.
Titel	Effect Sizes and their Intervals: The Two-Level Repeated Measures Case
Quelle	In: Educational and Psychological Measurement, 65 (2005) 2, S.241-258 (18 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0013-1644
DOI	10.1177/0013164404268675
Schlagwörter	Probability; Intervals; Least Squares Statistics; Effect Size; Computation; Measurement Techniques; Psychological Studies; Educational Research; Statistical Analysis + Suchen Sie Ihr Suchwort? Wahrscheinlichkeitsrechnung; Wahrscheinlichkeitstheorie; Messtechnik; Bildungsforschung; Pädagogische Forschung; Statistische Analyse
Abstract	Probability coverage for eight different confidence intervals (CIs) of measures of effect size (ES) in a two-level repeated measures design was investigated. The CIs and measures of ES differed with regard to whether they used least squares or robust estimates of central tendency and variability, whether the end critical points of the interval were obtained using a theoretical or an empirical sampling distribution, and whether the ESs used a pooled or nonpooled estimate of error variability. These intervals were compared when data were obtained from both normal and nonnormal distributions and when the population magnitude of effect, size of sample, and variance heterogeneity were varied. It was found that the ESs and intervals that used robust estimators and critical values were obtained through a bootstrap method better at controlling the probability coverage (i.e., within [.925, .975]). (Author).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10