Is there a possibility to convert eta squared to Cohen's d or r?
I uded this page (especially calculator 14) to transform different effect sizes into one:
https://www.psychometrica.de/effektstaerke.html
The source code was available. How did they calculate it? Do anyone know the source of the formula?
else if(index=="eta"){ eta = effect; var tmp = Math.sqrt(eta/(1-eta)); d = tmp2; r = Math.sqrt((dd)/((dd)+4)); f = d0.5;
