# Thread: Comparison of the cohen's ds of 2 independent studies

1. ## Comparison of the cohen's ds of 2 independent studies

Hello,
Is it possible to statistically compare the cohen's d of two studies in order to determine of one of the two Cohen's d is statistically significantly larger (or smaller) than the other one?
I have calculated Cohen's d for two virtually identical studies. In one study the cohen's d for control group vs. treatment group is 1.05; in the other study it is 1.31. In the second study Cohen's d is larger than in the first study. But can I perform a test to determine if the difference is statistically significant? If a statistical test is not possible is there a method/guidelines that would allow me to say if a difference of 0.26 between the 2 Cohen's d is small, medium or large (in other words relevant)? 0.26 is almost the same difference between 0.5 and 0.8 which were suggested by Cohen as medium and large effects respectively.
will

2. ## Re: Comparison of the cohen's ds of 2 independent studies

Do you have raw data or just summary statistics?

3. ## Re: Comparison of the cohen's ds of 2 independent studies

Hello
For one study I have raw data since it is a study I ran. For the other study I have summary statistics from the published paper (means, SDs, sample size)

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