[R-meta] weights in forest plot

Viechtbauer, Wolfgang (SP) wolfg@ng@viechtb@uer @ending from m@@@trichtuniver@ity@nl
Thu Aug 23 13:46:45 CEST 2018

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).


-----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.


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

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