[R-meta] Compiling different design in the same met-analysis
Dr. Gerta Rücker
ruecker @end|ng |rom |mb|@un|-|re|burg@de
Mon May 3 19:12:56 CEST 2021
Technically, you may conduct a meta-analysis of these two effects and
obtain something between. The question is how to interpret this.
Best,
Gerta
Am 03.05.2021 um 19:06 schrieb Michael Dewey:
> Yes, exactly. After all if you show two things are different you
> cannot say they are the same.
>
> Michael
>
> On 03/05/2021 15:59, Gladys Barragan-Jason wrote:
>> Okay, so you can't obtain an overall effect size while controlling
>> for design?
>>
>> Le lun. 3 mai 2021 à 14:36, Michael Dewey <lists using dewey.myzen.co.uk
>> <mailto:lists using dewey.myzen.co.uk>> a écrit :
>>
>> If you include a moderator you do not get an overall effect
>> because by
>> including it you are effectively saying there is no single overall
>> effect.
>>
>> On 03/05/2021 12:24, Gladys Barragan-Jason wrote:
>> > Hi Michael,
>> > Thanks a lot for your quick response. Here are answers and other
>> > questions below.
>> >
>> > Le lun. 3 mai 2021 à 12:41, Michael Dewey
>> <lists using dewey.myzen.co.uk <mailto:lists using dewey.myzen.co.uk>
>> > <mailto:lists using dewey.myzen.co.uk
>> <mailto:lists using dewey.myzen.co.uk>>> a écrit :
>> >
>> > Dear Gladys
>> >
>> > Comments in-line
>> >
>> > On 03/05/2021 08:13, Gladys Barragan-Jason wrote:
>> > > Dear all,
>> > >
>> > > I am doing a meta-analysis on experimental data on the
>> impact on
>> > > several behavioral interventions including both *pre-post
>> studies*
>> > > (measurement of a trait before and after the intervention)
>> *and
>> > control
>> > > vs. treatment studies *(measurement after a control
>> intervention vs.
>> > > measurement after the intervention).
>> >
>> > So the first design just has one group which is measured
>> twice and the
>> > second design has two parallel groups which are each measured
>> once?
>> >
>> >
>> > Exactly!
>> >
>> >
>> > > I am interested in the effect size of each type of
>> intervention on a
>> > > specific trait that is common to all studies.
>> > >
>> > > I would like to know whether it is correct to compile all
>> studies
>> > from
>> > > one type of intervention (whatever the type of
>> comparisons:
>> > pre-pot and
>> > > control vs. treatment group together) with pre- and
>> control being as
>> > > control and post and treatment being as treatment.
>> > >
>> >
>> > I do not think that is going to work well. Although the two
>> designs
>> > could be considered as estimating the same effect their
>> variability
>> > should be very different since in design 1 you have reduced
>> the effect
>> > of individual variability. If you do include both designs
>> in one
>> > analysis I would have thought it mandatory to include a
>> moderator with
>> > two levels for design.
>> >
>> > This makes sense. When I do this, I then obtain two effect sizes
>> (one
>> > for each design); (in having mods=~design-1). Do you know how I
>> can get
>> > the overall effect size?
>> >
>> >
>> > > I have a second question about how to thank the
>> > > r-sig-meta-analysis using r-project.org
>> <mailto:r-sig-meta-analysis using r-project.org>
>> > <mailto:r-sig-meta-analysis using r-project.org
>> <mailto:r-sig-meta-analysis using r-project.org>>
>> > > <mailto:r-sig-meta-analysis using r-project.org
>> <mailto:r-sig-meta-analysis using r-project.org>
>> > <mailto:r-sig-meta-analysis using r-project.org
>> <mailto:r-sig-meta-analysis using r-project.org>>> list for all their help
>> > > (acknowledgements in a paper).
>> >
>> > I would have thought the URL
>> > https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis//
>> <https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis//>
>> > <https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis//
>> <https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis//>>
>> > was better. How to do this will also depend on custom and
>> practice in
>> > your scientific discipline, some journals in mine require
>> people who
>> > are
>> > acknowledged to give their consent.
>> >
>> >
>> > Ok! Thanks a lot!
>> >
>> > Best,
>> > Gladys
>> >
>> >
>> > Michael
>> >
>> > >
>> > > Thanks a lot for your help!
>> > >
>> > > Have a great day,
>> > >
>> > > Gladys
>> > >
>> > > --
>> > >
>> > > ------------------------------------------
>> > >
>> > > Gladys Barragan-Jason, PhD. ____ Website
>> > > <https://sites.google.com/view/gladysbarraganjason/home
>> <https://sites.google.com/view/gladysbarraganjason/home>
>> > <https://sites.google.com/view/gladysbarraganjason/home
>> <https://sites.google.com/view/gladysbarraganjason/home>>>
>> > >
>> > > Station d'Ecologie Théorique et Expérimentale (SETE)____
>> > >
>> > > CNRS de Moulis____
>> > >
>> > > image.pngimage.png____
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
>>
>> >
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>>>
>>
>> >
>> > > Virus-free. www.avg.com <http://www.avg.com>
>> <http://www.avg.com <http://www.avg.com>>
>> > >
>> >
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
>>
>> >
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient
>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>>>
>>
>> >
>> > >
>> > >
>> > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>> > >
>> > > _______________________________________________
>> > > R-sig-meta-analysis mailing list
>> > > R-sig-meta-analysis using r-project.org
>> <mailto:R-sig-meta-analysis using r-project.org>
>> > <mailto:R-sig-meta-analysis using r-project.org
>> <mailto:R-sig-meta-analysis using r-project.org>>
>> > > https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis
>> <https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis>
>> > <https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis
>> <https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis>>
>> > >
>> >
>> > --
>> > Michael
>> > http://www.dewey.myzen.co.uk/home.html
>> <http://www.dewey.myzen.co.uk/home.html>
>> > <http://www.dewey.myzen.co.uk/home.html
>> <http://www.dewey.myzen.co.uk/home.html>>
>> >
>> >
>> >
>> > --
>> >
>> > ------------------------------------------
>> >
>> > Gladys Barragan-Jason, PhD. ____ Website
>> > <https://sites.google.com/view/gladysbarraganjason/home
>> <https://sites.google.com/view/gladysbarraganjason/home>>
>> >
>> > Station d'Ecologie Théorique et Expérimentale (SETE)____
>> >
>> > CNRS de Moulis____
>> >
>> > image.pngimage.png____
>> >
>> >
>> >
>>
>> -- Michael
>> http://www.dewey.myzen.co.uk/home.html
>> <http://www.dewey.myzen.co.uk/home.html>
>>
>
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