Originally Posted by

**lk145**
I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set.

Is it possible to do this? How is the formula different if you're converting from partial eta squared? I'm a research assistant so I don't know much about stats to begin with. If anyone could explain what exactly the difference is between eta squared and cohen's d (specifically how is effect size different from cohen's d--I don't mean in terms of scale and what's a large effect size. I mean conceptually, why would one pick eta squared over cohen's d and vice versa) that would be very helpful too.

Thanks,

LK