[R-meta] Compiling different design in the same met-analysis
Michael Dewey
||@t@ @end|ng |rom dewey@myzen@co@uk
Mon May 3 19:06:12 CEST 2021
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____
> > >
> > >
> > >
> > >
> > >
> >
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> > >
> > >
> > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> > >
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> >
> > --
> > 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>
>
--
Michael
http://www.dewey.myzen.co.uk/home.html
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