[R-meta] forest plot function overall effect size rounded

[Gabriel Cotlier]

Dear Wolfgang,
Thank you very much for your help.
Kind regards,
Gabriel


On Thu, Oct 19, 2023 at 12:10 AM Viechtbauer, Wolfgang (NP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:

> I have to say that this is a strange thing to do, but here is an example
> showing how this can be done:
>
> library(metafor)
>
> dat <- escalc(measure="OR", ai=tpos, bi=tneg, ci=cpos, di=cneg,
> data=dat.bcg,
>                             slab=paste0(author, ", ", year))
>
> res <- rma(yi, vi, data=dat)
> res
>
> forest(res)
>
> res$beta <- as.numeric(sprintf("%1.2f", ((trunc(100 * coef(res)) / 100))))
> forest(res)
>
> Again, not something I would ever recommend doing.
>
> Best,
> Wolfgang
>
> > -----Original Message-----
> > From: R-sig-meta-analysis <r-sig-meta-analysis-bounces using r-project.org>
> On Behalf
> > Of Gabriel Cotlier via R-sig-meta-analysis
> > Sent: Wednesday, October 11, 2023 18:04
> > To: Michael Dewey <lists using dewey.myzen.co.uk>
> > Cc: Gabriel Cotlier <gabiklm01 using gmail.com>; R Special Interest Group for
> Meta-
> > Analysis <r-sig-meta-analysis using r-project.org>
> > Subject: Re: [R-meta] forest plot function overall effect size rounded
> >
> > Yes, indeed, sprintf("%1.2f", ((trunc(100 * 0.7080) / 100))) is a good
> > solution.
> > Do you know how to plug the value into the forest plot location where the
> > overall effect size is (lower right-hand side corner)?
> > Thanks a lot.
> > Gabriel
> >
> > On Wed, Oct 11, 2023 at 6:46 PM Michael Dewey <lists using dewey.myzen.co.uk>
> > wrote:
> >
> > > Do you mean something like
> > >
> > > sprintf("%1.2f", ((trunc(100 * 0.7080) / 100)))
> > >
> > > perhaps?
> > >
> > > Michael
> > >
> > > On 11/10/2023 16:31, Gabriel Cotlier wrote:
> > > > Dear Michael,
> > > >
> > > > Thank you very much for clarifying it. You are indeed right; one
> thing
> > > > is rounding and the other is simply retrieving a given number of
> digits
> > > > or number precision, at least as far as I understand it.
> > > > I just would like to appear in the forest plot exactly the same value
> > > > that gives the model results or output for the overall effect size,
> but
> > > > if the model's output is, for instance, 0.7080 and such a number is
> too
> > > > large, well then only the first 2 digits after the point would be
> 0.70.
> > > >
> > > > Thanks a lot for your help.
> > > > Kind regards,
> > > > Gabriel
> > > >
> > > > On Wed, Oct 11, 2023 at 5:46 PM Michael Dewey <
> lists using dewey.myzen.co.uk
> > > > <mailto:lists using dewey.myzen.co.uk>> wrote:
> > > >
> > > >     Dear Gabriel
> > > >
> > > >     Comments in-line
> > > >
> > > >     On 11/10/2023 15:10, Gabriel Cotlier via R-sig-meta-analysis
> wrote:
> > > >      > Hello all,
> > > >      > I would like to ask how to modify in the forest plot the
> value of
> > > the
> > > >      > overall effect size to be round (overall_effect_size, 1)
> since it
> > > >      > aurtomatically does round(overall_effect_size, 2) for
> instance in
> > > >     my case
> > > >      > the model's output overall effect size is :
> > > >      >
> > > >      > p0 <- predict(res)
> > > >      > p0
> > > >      > # pred     se ci.lb <http://ci.lb>  ci.ub pi.lb <http://pi.lb
> >
> > > pi.ub
> > > >      > # 0.7080 0.2950 0.1297 1.2863 -2.9950 4.4110
> > > >      >
> > > >      > That is 0.7080 but in the forest lot is round(0.7080, 2) that
> is
> > > >     0.71 as it
> > > >      > appears in the forest plot (lower right corner):
> > > >      >
> > > >      >    100% 0.71 [0.13, 1.29]
> > > >      >
> > > >      > Therefore I would like to access the variable in the forest
> plot
> > > >     and set it
> > > >      > to be round(0.7080, 1) so as to have the overall effect size
> as
> > > >     is in the
> > > >      > model output, that is 0.70 or alternatively 0.7080.
> > > >
> > > >     But round(0.7080, 1) is 0.7, not 0.70. Rounded to 2 decimals it
> is
> > > 0.71
> > > >     which you state you do not want. Perhaps it would help if you
> > > explained
> > > >     what you mean by rounding as what you ask does not seem to
> > > >     correspond to
> > > >     what is usually meant by the term.
> > > >
> > > >     Michael
> > > >
> > > >      >
> > > >      > Thanks a lot.
> > > >      > Kid regards,
> > > >      > Gabriel
>

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