Sample size calculation using Cohen's d / Hedges's g

[Laura Pape]

Hi everyone,

Can anyone please advise me on how to perform a sample size calculation using Cohen's d or Hedges's g?

I have given:
Expected effect size: g= 0.69
Two tailed significance level: alpha= 0.05
Power: 0.80

Which option should I use in Stata to perform the calculation?

Kind regards,
Laura

[Ken Chui]

Please see this another thread, assuming you're planning an independent sample t-test.

[Laura Pape]

Thank you!!!