[R-meta] Log transformation

Gerta Ruecker Ruecker at imbi.uni-freiburg.de
Sat Mar 17 13:08:41 CET 2018

I cannot think of any interpretation at all. Values of standardized mean difference (SMD) can be on the whole real scale, with zero in the middle. To which aim should they be log-transformed? The log can be applied only to positive numbers. What if the SMD would have been negative? Do the authors give any motivation?

Best, Gerta
----------------ursprüngliche Nachricht-----------------
Von: MK [theoneliberatedkaur at gmail.com  ]
An: r-sig-meta-analysis at r-project.org,  "Viechtbauer Wolfgang (SP)" [wolfgang.viechtbauer at maastrichtuniversity.nl  ]
Datum: Fri, 16 Mar 2018 22:41:23 -0400
> Hi everybody,
> I have been doing a meta-analysis in R. One of my articles present with an
> effect size of log of standardized mean difference (= -0.2).
> Could someone help me with its interpretation?
> That would be a great help.
> Thank you,
> MK
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Gerta Ruecker
Institute of Medical Biometry and Statistics,
Faculty of Medicine and Medical Center - University of Freiburg
Postal Address: Stefan-Meier-Str. 26, 79104 Freiburg
Phone: +49/761/	203-6673
Mail: Ruecker at imbi.uni-freiburg.de  Homepage: http://www.imbi.uni-freiburg.de

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