[R-meta] modifying the default forest plot
theoneliberatedkaur at gmail.com
Tue Feb 13 21:10:44 CET 2018
For some reason I am not able to use the
On Tue, Dec 5, 2017 at 6:06 PM, Viechtbauer Wolfgang (SP) <
wolfgang.viechtbauer at maastrichtuniversity.nl> wrote:
> Please always cc the list.
> As for adjusting the arrangement of the various elements in the plot, you
> have two options:
> 1) Make the plotting device wider. I don't know how you are creating the
> plot, but if you are doing this 'interactively', you can just do this by
> increasing the width of the window for the plot. If you are using something
> like png(), pdf(), or some other plotting device to save the plot, then you
> adjust the 'width' argument.
> 2) You can also play around with the 'xlim' argument. First do this:
> print(forest(random13, showweights=TRUE, xlab='Estimated Effect Size',
> order="obs", slab=paste(play1$author, play1$year, sep=", ")))
> Note the default value for 'xlim'. Then rerun the forest() command as
> above (without the print()) but adjust 'xlim', that is, use xlim=c(lower,
> upper). Increase/decrease the lower and upper values to see how this
> affects the plot.
> To label elements, use text(). For example:
> text(lower, 15, "Author(s) and Year", pos=4)
> text(upper, 15, "ES [95% CI]", pos=2)
> where lower/upper are the values you specified for xlim and you need to
> adjust the '15' depending on how many rows are in your forest plot (the
> second value of text() determines the y coordinate where the text is
> written). You can use text() to also add a label for the weights.
> You might also want to go through the examples at the end of
> help(forest.rma) to get an idea of what can be done.
> -----Original Message-----
> From: Mukht Kaur [mailto:theoneliberatedkaur at gmail.com]
> Sent: Tuesday, 05 December, 2017 23:31
> To: Viechtbauer Wolfgang (SP)
> Subject: Re: [R-meta] modifying the default forest plot
> Thank you guys! So I successfully made edits to my default forest plot
> forest (random13, showweights=TRUE, xlab='Estimated Effect Size',
> order="obs", slab=paste(play1$author, play1$year, sep=", "))
> The weights assigned are represented in the figure but they seem too close
> to the CIs. Is there a way to label them and CIs? I looked at other
> arguments which can be used for the 'forest' function. None seem applicable
> to the labelling I intend to do. Any ideas?
> On Tue, Dec 5, 2017 at 4:58 AM, Viechtbauer Wolfgang (SP) <
> wolfgang.viechtbauer at maastrichtuniversity.nl> wrote:
> Ken already gave some pointers.
> 1) How could I get the author and year instead?
> Use the 'slab' argument. For example:
> slab=paste(dat$author, dat$year, sep=", "))
> (assuming that there are 'author' and 'year' variables in the data frame
> 2) It would be better if I can get them arranged according to the observed
> effect size - is that possible?
> Use argument: order="obs"
> 3) Also, I would like to change the title of my X axis to 'Estimated
> Effect Size'
> rather than the default title 'Observed Outcome'.
> Use argument: xlab="Estimated Effect Size"
> 4) Lastly, would it be possible to specify the exact weight assigned to
> each study in the forest plot?
> Use argument: showweights=TRUE
> -----Original Message-----
> From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-
> bounces at r-project.org] On Behalf Of Mukht Kaur
> Sent: Tuesday, 05 December, 2017 6:30
> To: r-sig-meta-analysis at r-project.org
> Subject: [R-meta] modifying the default forest plot
> Hi everyone!
> I am new to meta-analysis methodology and I am using R software to do my
> quantitative synthesis. I am using random effects model to analyse my
> individual studies through rma function in metafor package.
> By using 'forest(mymodelname)', I have a basic forest plot where my
> individual studies are shown as Study 1, Study 2, and so on. How could I
> get the author and year instead? It would be better if I can get them
> arranged according to the observed effect size - is that possible? Also, I
> would like to change the title of my X axis to 'Estimated Effect Size'
> rather than the default title 'Observed Outcome'. Lastly, would it be
> possible to specify the exact weight assigned to each study in the forest
> Many thanks in advance for your help.
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