Hi Everyone
I have a question about reporting effect size but am finding it difficult to get a clear answer from a lot of sources I have read online. Basically I was wondering if it is statistically correct to report either Cohen's d or Pearson's r effect sizes from a within-subjects design with data analysed through a one-tailed paired t-test.
The data itself is collected through pre and post questionnaires for a social work intervention. In our evaluation reports we report the percentage change between pre- and post-test means, however I would also like to report this in a more scientific way through effect size if possible.
In hours of online research I've only found very few sources to say this is possible (or at least to specifically say so), as the majority of information I find seems to say effect sizes can only be reported when you have a between-subjects design, for example with a treatment and control group.
Any information would be greatly appreciated, thanks in advance.
Mike
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