[R-meta] Meta-analysis with R, use treatment effect as input instead of 2 groups?

Felix M rmailing.lstfm at gmail.com
Tue Oct 17 20:55:48 CEST 2017

Dear Guido,

thank you very much for the swift reply. Yes, that is indeed the
information I have available for each study.

I will start testing this right away! I may have more detailed questions

I'll study the help pages as well of course. I just didn't know where to
start on this particular issue, and I figured it would be best to just ask
people who already have lots of experience with the software. I'm glad this
mailing list exists!

Best regards, Felix

2017-10-17 20:18 GMT+02:00 Guido Schwarzer <sc at imbi.uni-freiburg.de>:

> Am 17.10.17 um 17:57 schrieb Felix M:
>> Dear All,
>> I’m fairly new to R and would like to meta-analyze data where I only have
>> available the differences between the outcomes for the experimental groups
>> and the control groups, as well as the SEMs and SDs of those delta values.
> I assume that you have the following information for each study:
> delta = mean difference between experimental and control group
> SEM = standard error of delta
> SD = standard deviation of delta
> In order to conduct a meta-analysis you only need delta and SEM.
> You can use, for example, metagen() in R package meta in the following way:
> metagen(delta, SEM)
> Similarly, you can use rma() in R package metafor:
> rma(yi = delta, sei = SEM)
> See the corresponding help pages for more information, e.g. help(metagen).
> Best wishes,
> Guido
> --
> Dr. Guido Schwarzer (sc at imbi.uni-freiburg.de)
> Institute for Medical Biometry and Statistics
> Stefan-Meier-Str. 26, D-79104 Freiburg | Phone: +49 (0)761 203 6668
> http://www.imbi.uni-freiburg.de        | Fax:   +49 (0)761 203 6680

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