[R-meta] Best choice of effect size

Luke Martinez m@rt|nez|ukerm @end|ng |rom gm@||@com
Wed Sep 29 19:12:16 CEST 2021

Dear All,

I'm doing a meta-analysis where the papers report only "mean" and "sd"
of some form of proportion and/or "mean" and "sd" of corresponding raw
frequencies. (For context, the papers ask students to read, find, and
correct the wrong words in a text.)

By some form of proportion, I mean, some papers report actual proportions:

proportion_type1 = # of corrected items / all items needing correction

Some paper report a modified version of proportions:

proportion_type2 = # of corrected items / (all items needing
correction + all wrongly corrected items)

There are other versions of proportions and corresponding raw
frequencies as well. But my question is given that all these studies
only report "mean" and "sd", can I simply use a SMD effect size?

Many thanks,

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