[R-meta] Setting non-log x axis and tick marks organized when "atransf = exp" is used in the forest plot

[Win Thu]

Dear Wolfgang,

Thank you very much for prompt help. It works!
Thank you also for adding shade function in the latest version which is
really helpful.

Best regards
Win

On Sat, 3 Jun 2023 at 1:02 AM, Viechtbauer, Wolfgang (NP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:

> Dear Win,
>
> I am not entirely sure I understand exactly what you want, but I think you
> want to use the 'transf' argument instead of 'atransf'. For example:
>
> library(metafor)
>
> dat <- dat.bcg
> dat <- escalc(measure="RR", ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat,
>               slab=paste0(author, ", ", year))
> res <- rma(yi, vi, data=dat)
>
> # forest plot of the log risk ratios
> forest(res, header=TRUE)
>
> # forest plot of the risk ratios (log scale for the x-axis)
> forest(res, header=TRUE, atransf=exp, at=log(c(0.05, 0.25, 1, 4)))
>
> # forest plot of the risk ratios
> forest(res, header=TRUE, transf=exp, alim=c(0,4), refline=1)
>
> In the last case, the CIs will be asymmetric since exp() is a non-linear
> transformation.
>
> Best,
> Wolfgang
>
> >-----Original Message-----
> >From: R-sig-meta-analysis [mailto:
> r-sig-meta-analysis-bounces using r-project.org] On
> >Behalf Of Win Thu via R-sig-meta-analysis
> >Sent: Friday, 02 June, 2023 13:52
> >To: r-sig-meta-analysis using r-project.org
> >Cc: Win Thu
> >Subject: [R-meta] Setting non-log x axis and tick marks organized when
> "atransf =
> >exp" is used in the forest plot
> >
> >Hello,
> >
> >Currently, I finished a meta-analysis using metafor. Please advise how I
> can keep
> >the X axis scale organized in the forest plot without needing to change
> it into a
> >log scale when "atransf = exp" is used in the forest function.
> >
> >I used "atransf = exp" as I want to show the risk estimates and the
> result on a
> >normal scale in the forest plot.
> >The code is: forest (meta, atransf = exp) which gave me a X axis and tick
> marks
> >not organized well and sometimes bizarre (fig below).
> >
> >I need to use: forest (meta, atransf = exp, at = log (c(0.5,1,1.5)) to
> get a more
> >organized x axis (fig below) but the X axis scale is now in log scale
> while
> >the result is not in log scale. The journal I want to publish asks to
> keep the X
> >axis scale same with the relative risk scale. I want to keep relative
> risk on a
> >normal scale, and thus, the X axis should not be in log scale.
> >
> >Your help will be greatly appreciated as I was trying several days and
> hours
> >without success.
> >
> >Thank you very much in advance,
> >Win
>

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