[R-meta] effect size for proportion with respect to the chance expected

[Patrizio Tressoldi]

Il 16/08/2018 10:10, Viechtbauer, Wolfgang (SP) ha scritto:
> Dear Patrizio,
>
> What kind of 'effect size' do you want to compute? One could compute the difference between the observed proportion and the expected one (50/100 - .25), or one could compute the (log transformed) ratio (log((50/100) / .25)), or one could compute the (log transformed) odds ratio (log((50/100) / ((100-50)/100) / (.25 / (1 - .25)))), or ... So which one ar you interested in?
>
For the moment I need to compute the difference between the observed and
the expected proportion.

Thanks
Patrizio