-----Original Message-----
From: Homa Keshavarz [mailto:homa.keshavarz12 at gmail.com]
Sent: Wednesday, 16 December, 2020 16:08
To: Viechtbauer, Wolfgang (SP)
Cc: Homa Keshavarz
Subject: RE: [R-meta] aggregate data continues outcomes
Dear Wolfgang,
Thank you for answering my question.
I need group B and C combine:
Group A: mean =1248 Sd= 698 n=15
Group B: mean =2381 Sd= 1313 n=15
Group C: mean =1878 Sd= 720 n=15
I do not use R. is there any other way e.g. SPSS or formula in excel please?
I do appreciate your time,
Homa
-----Original Message-----
From: Viechtbauer, Wolfgang (SP)
<wolfgang.viechtbauer at maastrichtuniversity.nl>
Sent: Wednesday, December 16, 2020 2:06 AM
To: Homa Keshavarz <homa.keshavarz12 at gmail.com>;
r-sig-meta-analysis at r-project.org
Subject: RE: [R-meta] aggregate data continues outcomes
Dear Homa,
Please post in plain text. Note how the formatting of the table is messed up
when not doing so, making it difficult for people to read the table and
provide help.
It would also help if you would provide the table in a way that it can be
directly generated within R (e.g., using dput()). See the following links
for how to create reproducible examples:
https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducib
le-example
http://adv-r.had.co.nz/Reproducibility.html
https://cran.r-project.org/web/packages/reprex/vignettes/reprex-dos-and-dont
s.html
Not sure what effect size measure you intend to use. Standardized mean
differences? If so, you will find an example and code that deals with this
kind of data here:
http://www.metafor-project.org/doku.php/analyses:gleser2009#quantitative_res
ponse_variable
In essence, you need to compute the var-cov matrix of the two effects and
then you can combine them with rma.mv(). If you provide the table in such a
way that it can be directly generated within R, I can help further.
Best,
Wolfgang
-----Original Message-----
From: R-sig-meta-analysis
[mailto:r-sig-meta-analysis-bounces at r-project.org]
On Behalf Of Homa Keshavarz
Sent: Tuesday, 15 December, 2020 19:27
To: 'R?ver, Christian'; r-sig-meta-analysis at r-project.org
Subject: [R-meta] aggregate data continues outcomes
I do appreciate it if you direct me how to aggregate the 2 groups below.
This study has 3 arms, comparison between A , B, and C.
Group 1: A compare to B
Group 2: A compare to C
I need to aggregate theses 2 groups
M SD N M DD N
Group1 1248.0 698.0 15 2381.0 1313.0 15
Group2 1248.0 698.0 15 1878.0 720.0 15
Many thanks in advance,
Homa