Comprehensive Evaluation of Reference Values of Parametric and Non-Parametric Effect Size Methods for Two Independent Groups

In the field of health and other sciences, effect size (ES) provides a scientific approach to effectiveness treatment or intervention. The p-value indicates whether statistical difference depends on chance, while ES gives information about intervention, even if is not significant. For this reason, has become very popular measure in recent years. It which will be used based distribution data number groups. study, parametric non-parametric were evaluated for two independent groups.
 When literature was examined, there no studies aimed at evaluating reference values methods groups re-evaluated by simulation study. As result, small value determined differently from literature. been seen that are valid cases where skewness low, new have proposed varying level.