naa a22 4500 510776485 CHVBK 20180411083232.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.3758/s13428-012-0228-7 doi (NATIONALLICENCE)springer-10.3758/s13428-012-0228-7 Shieh Gwowen Department of Management Science, National Chiao Tung University, 30010, Hsinchu, Taiwan, Republic of China aut Confidence intervals and sample size calculations for the weighted eta-squared effect sizes in one-way heteroscedastic ANOVA [Elektronische Daten] [Gwowen Shieh] Effect size reporting and interpreting practices have been extensively recommended in academic journals when primary outcomes of all empirical studies have been analyzed. This article presents an alternative approach to constructing confidence intervals of the weighted eta-squared effect size within the context of one-way heteroscedastic ANOVA models. It is shown that the proposed interval procedure has advantages over an existing method in its theoretical justification, computational simplicity, and numerical performance. For design planning, the corresponding sample size procedures for precise interval estimation of the weighted eta-squared association measure are also delineated. Specifically, the developed formulas compute the necessary sample sizes with respect to the considerations of expected confidence interval width and tolerance probability of interval width within a designated value. Supplementary computer programs are provided to aid the implementation of the suggested techniques in practical applications of ANOVA designs when the assumption of homogeneous variances is not tenable. Psychonomic Society, Inc., 2012 Heteroscedasticity nationallicence Precision nationallicence Welch's statistic nationallicence Behavior Research Methods Springer-Verlag 45/1(2013-03-01), 25-37 45:1<25 2013 45 13428 https://doi.org/10.3758/s13428-012-0228-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3758/s13428-012-0228-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Shieh Gwowen Department of Management Science, National Chiao Tung University, 30010, Hsinchu, Taiwan, Republic of China aut NATIONALLICENCE 773 0- Behavior Research Methods Springer-Verlag 45/1(2013-03-01), 25-37 45:1<25 2013 45 13428 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer