[R-meta] integrating SMD, ZCOR and ZPCOR

Tue Aug 28 11:07:02 CEST 2018

Dear all,

With the "escalc" function I calculated different effect sizes depending on the existing data (SMD, ZCOR, ZPCOR). For obtaining overall effects, can I treat the resulting yi in the same way? I mean, can I just integrate them in my random effect model by the "rma.uni" function without specifying what kind of effect size it is?

And how to interpret resulting overall effect sizes? Can these be interpreted like Cohen's d?

Kind regards,
Katrin

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Betreff: R-sig-meta-analysis Digest, Vol 15, Issue 32

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Today's Topics:

   1. weights in forest plot (Antonia Sudkaemper)
   2. Re: weights in forest plot (Viechtbauer, Wolfgang (SP))
   3. Re: weights in forest plot (Antonia Sudkaemper)
   4. Re: weights in forest plot (Michael Dewey)
   5. Implementation of the Inverse variance heterogeneity model
      (Suhail Doi)

----------------------------------------------------------------------

Message: 1
Date: Wed, 22 Aug 2018 11:05:23 +0100
From: Antonia Sudkaemper <a.sudkaemper using gmail.com>
To: r-sig-meta-analysis using r-project.org
Subject: [R-meta] weights in forest plot
Message-ID:
	<CAPQcPuhsKj1uBvRUFZw3E5_VR25TLRL4_yZEXTRWZ+4ZWBjGdw using mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

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

	[[alternative HTML version deleted]]

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Message: 2
Date: Wed, 22 Aug 2018 10:59:49 +0000
From: "Viechtbauer, Wolfgang (SP)"
	<wolfgang.viechtbauer using maastrichtuniversity.nl>
To: Antonia Sudkaemper <a.sudkaemper using gmail.com>,
	"r-sig-meta-analysis using r-project.org"
	<r-sig-meta-analysis using r-project.org>
Subject: Re: [R-meta] weights in forest plot
Message-ID: <2817483ac4f649be844b7d3922a44d3d using UM-MAIL3213.unimaas.nl>
Content-Type: text/plain; charset="utf-8"

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

------------------------------

Message: 3
Date: Wed, 22 Aug 2018 14:36:05 +0100
From: Antonia Sudkaemper <a.sudkaemper using gmail.com>
To: "Viechtbauer, Wolfgang (SP)"
	<wolfgang.viechtbauer using maastrichtuniversity.nl>
Cc: r-sig-meta-analysis using r-project.org
Subject: Re: [R-meta] weights in forest plot
Message-ID:
	<CAPQcPuh50gWu883k8pskWxVyZbK45MV8DjkM5aYje-GTmF3cLw using mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

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
>

-- 
Antonia Sudkämper
PhD Candidate in Organizational Psychology/University of Exeter
www.antoniasudkaemper.com
a.sudkaemper using gmail.com

	[[alternative HTML version deleted]]

------------------------------

Message: 4
Date: Wed, 22 Aug 2018 15:32:32 +0100
From: Michael Dewey <lists using dewey.myzen.co.uk>
To: Antonia Sudkaemper <a.sudkaemper using gmail.com>, "Viechtbauer,
	Wolfgang (SP)" <wolfgang.viechtbauer using maastrichtuniversity.nl>
Cc: r-sig-meta-analysis using r-project.org
Subject: Re: [R-meta] weights in forest plot
Message-ID: <cb465466-51ff-e580-6f9f-5817f2e8d351 using dewey.myzen.co.uk>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

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.

Mchael

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
>>
> 
> 

-- 
Michael
http://www.dewey.myzen.co.uk/home.html

------------------------------

Message: 5
Date: Thu, 23 Aug 2018 10:27:23 +0300
From: Suhail Doi <sdoi using gmx.com>
To: r-sig-meta-analysis using r-project.org, dirk.richter using upd.unibe.ch
Subject: [R-meta] Implementation of the Inverse variance heterogeneity
	model
Message-ID: <bb5e3fae-e5f1-b77a-ce3e-22bc0c646d23 using gmx.com>
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