[R-meta] modifying the default forest plot

[Viechtbauer Wolfgang (SP)]

The problem is the use of 'random$author' and 'random$author'. Object 'random' does not contain these elements. I assume 'mv3' does.

Best,
Wolfgang

>-----Original Message-----
>From: Michael Dewey [mailto:lists at dewey.myzen.co.uk]
>Sent: Saturday, 17 February, 2018 14:39
>To: Mukht Kaur; Viechtbauer Wolfgang (SP); r-sig-meta-analysis at r-
>project.org
>Subject: Re: [R-meta] modifying the default forest plot
>
>Dear Mukht
>
>When you fit the model try specifying slab there and see what happens.
>
>Michael
>
>On 16/02/2018 20:28, Mukht Kaur wrote:
>> Hi Wolfgang,
>> Here's how I fit the model:
>> random <-rma(yi=effsiz, sei=se, data=mv3)
>>
>> When I try to get the labels for author and year instead of Study 1,
>Study
>> 2, in my forest plot, the statement used and error is shown below:
>>
>> forest(random, showweights=TRUE, xlab='Estimated Effect Size',
>> order="obs",slab=paste(random$author,random$year, sep=", "))
>> Error in forest.rma(random, showweights = TRUE, xlab = "Estimated
>Effect
>> Size",  :
>>    Number of outcomes does not correspond to the length of the 'slab'
>> argument.
>>
>> Please let me know.
>>
>> Thanks
>>
>> 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
>>> 'dat').
>>>
>>> 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
>>>
>>> Best,
>>> Wolfgang
>>>
>>> -----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
>>> plot?
>>> Many thanks in advance for your help.
>>>
>>> MK