[R-meta] Calculate individual SDs from ES's SDs

[James Pustejovsky]

I would hazard a guess that the +/- 0.07, which is described as "SD", might
actually be the standard error of the effect size estimate. So in the
example, ES = 1.38 and sampling variance = 0.07^2 = 0.049. Perhaps you can
verify this speculation using other information in the source document.

James

On Wed, Feb 21, 2018 at 6:41 AM, Cesar Terrer Moreno <cesar.terrer at me.com>
wrote:

> Dear all,
>
> I have a series of effects sizes, expressed as e.g.:
>
> 1.38 ± 0.07 (MEANexp/MEANcontrol, SD, n=3)
>
> I have to express these experiments as MEANexp, SDexp, MEANcontrol,
> SDcontrol in order to put all data in a correct formar that can be read by
> escalc in metafor.
>
> I guess I can assume MEANexp = 1.38 and MEANcontrol = 1, but how can I
> compute SDs so that escalc computes the effect size’s variance properly?
>
> Thanks
> César
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