We are 2 psychology students writing a systematic review. We need to convert the effect sizes from the different studies to Cohen's d (or another standardized effect size).

Can anyone help converting Hazard Rate Ratio (HHR) and Relative Risk (RR) to standardized effect size (eg Cohen's d)? Or how to convert HHR and RR to Odds Ratio, which we know how to convert to Cohen's d?

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