Dear colleagues working with effect sizes,
I'm not sure whether I created something already created before me. Anyhow, I derived several general formulae for Cohen's d which can be used fo assessing the magnitude of the effect size of several means. Usually d is restricted for the case of two means. My formulae can be used for several means (and two means is the special case). I would appreciate if you take time and glance the text and tell if this is already created/developed abd by whom. Obviously, any feedback is taken positively.
The text can be found at Preprint Generalized Cohen d for polytomous settings
Jari