[R-meta] weights in forest plot

[Antonia Sudkaemper]

Hello Michael and Wolfgang,

thank you very much for your replies!

I changed the height argument and I think that worked, great!

As for addpoly() - the metafor manual only gives an example for a
meta-analysis that was run with rma in R. I did not run the meta-analysis
in R, however, but entered the values manually, and can hence not use the
predict(res) function as suggested? How would I do it in this case? (see
code below)

hedgesg = c(-0.19, 0.10, 0.26, 0.60, 0.25)
sei <- c(.16, .07, .18, .13, .11)
ci.lb <- hedgesg - 1.96*sei
ci.ub <- hedgesg + 1.96*sei
study<-c("1", "2", "3", "4", "5")
labels<-c(-2, -1, 0, 1, 2)

forest(hedgesg, ci.lb=ci.lb, ci.ub=ci.ub, showweights=TRUE, refline=0, xlab
= "Hedges' g", slab=study, alim = c(-2,2), xlim=c(-8,5), at=labels, cex =
0.9)

All the best, Antonia



On Thu, 23 Aug 2018 at 13:13, Viechtbauer, Wolfgang (SP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:

> To follow-up on this:
>
> I think it is better to adjust the size of the plotting device. Use png(),
> pdf(), etc. and adjust the 'height' argument.
>
> As for adding a summary polygon, see help(addpoly).
>
> Best,
> Wolfgang
>
> -----Original Message-----
> From: Michael Dewey [mailto:lists using dewey.myzen.co.uk]
> Sent: Wednesday, 22 August, 2018 16:33
> To: Antonia Sudkaemper; Viechtbauer, Wolfgang (SP)
> Cc: r-sig-meta-analysis using r-project.org
> Subject: Re: [R-meta] weights in forest plot
>
> Dear Antonia
>
> As far as spacing is concerned I think you might consider the rows =
> parameter. You give it a vector of the rows where you want estimates
> plotted. It may not do exactly what you want though, but worth a try.
>
> Mchael
>
> On 22/08/2018 14:36, Antonia Sudkaemper wrote:
> > Thank you very much, Wolfgang - this worked very well! (Previously I had
> > not specified the standard error, hence it didn't work...)
> >
> > I have to follow-up questions, however.
> >
> > 1) How can I add a summary polygon to this plot indicating the Mean
> > Weighted Effect Size at the bottom of the plot, as is done automatically
> > when using the forest.rma function?
> >
> > 2) (How) Can I adjust the space between the rows? I am asking as I am
> > producing two different plots for the same study and I would like them to
> > look similar. One of the plots includes a lot more studies than the other
> > one though, and hence the space between the rows varies. Can I change
> this
> > so that the plots look similar?
> >
> > Again, thank you so much for your help! All the best, Antonia
> >
> > On Wed, 22 Aug 2018 at 12:00, Viechtbauer, Wolfgang (SP) <
> > wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:
> >
> >> Hi Antonia,
> >>
> >> This works just fine for me:
> >>
> >> yi <- c(.23, .55, .33)
> >> sei <- rep(.1, 3)
> >> ci.lb <- yi - 1.96*sei
> >> ci.ub <- yi + 1.96*sei
> >> forest(yi, ci.lb=ci.lb, ci.ub=ci.ub, showweights=TRUE, alim=c(0,1),
> >> refline=NA)
> >>
> >> Best,
> >> Wolfgang
> >>
> >> -----Original Message-----
> >> From: R-sig-meta-analysis [mailto:
> >> r-sig-meta-analysis-bounces using r-project.org] On Behalf Of Antonia
> Sudkaemper
> >> Sent: Wednesday, 22 August, 2018 12:05
> >> To: r-sig-meta-analysis using r-project.org
> >> Subject: [R-meta] weights in forest plot
> >>
> >> Hello metafor users,
> >>
> >> I am currently making a forest plot for a meta-analysis, I am using
> >> forest.default and am using vectors with the effect size, low CI, high
> CI
> >> as input.
> >>
> >>   I have been wondering whether there is a possibility to also display
> the
> >> weights used for each study? A colleague suggested to do this via the
> >> little squares that display the effect sizes, but I am not sure how that
> >> would work - any ideas?
> >>
> >> I found the "showweights" function, but when I set it to TRUE all values
> >> displayed are "0"- how can I enter a vector with the different weights
> per
> >> study?
> >>
> >> Thank you very much for your help.
> >>
> >> All the best, Antonia
> >>
> >> --
> >> Antonia Sudkämper
> >> PhD Candidate in Organizational Psychology/University of Exeter
> >> www.antoniasudkaemper.com
> >> a.sudkaemper using gmail.com
>


-- 
Antonia Sudkämper
PhD Candidate in Organizational Psychology/University of Exeter
www.antoniasudkaemper.com
a.sudkaemper using gmail.com

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