R help - Dec 2012 - a problem for metafor package

Dear sir or madam
 
I want to know how to use "metafor"package do a meta anlysis,  forest
plot  show the results of whole study and  results of two subgroups
like this the forest plot show in the attachment.
 
looking forword to your reply
 

 
Regards and Cheers
 
Xudong Liu

 
School of Public Health and Primary Care
The Chinese University of Hong Kong
Email: liuxudong at cuhk.edu.hk

 

> Subject: Welcome to the "R-help" mailing list (Digest mode)
> From: r-help-request at r-project.org
> To: idliuxudong at hotmail.com
> Date: Mon, 31 Dec 2012 10:08:53 +0100
> 
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The attachement did not come through  and we need some idea of what you are
doing. Please see https://github.com/hadley/devtools/wiki/Reproducibility for
some ideas of what we need.

And please read the posting guide

John Kane
Kingston ON Canada

> -----Original Message-----
> From: idliuxudong at hotmail.com
> Sent: Mon, 31 Dec 2012 17:21:23 +0800
> To: r-help at r-project.org
> Subject: [R] a problem for metafor package
> 
> 
> Dear sir or madam
> 
> I want to know how to use "metafor"package do a meta anlysis, 
forest
> plot  show the results of whole study and  results of two subgroups
> like this the forest plot show in the attachment.
> 
> looking forword to your reply
> 
> 
> 
> Regards and Cheers
> 
> Xudong Liu
> 
> 
> School of Public Health and Primary Care
> The Chinese University of Hong Kong
> Email: liuxudong at cuhk.edu.hk
> 
> 
> 
> 
>> Subject: Welcome to the "R-help" mailing list (Digest mode)
>> From: r-help-request at r-project.org
>> To: idliuxudong at hotmail.com
>> Date: Mon, 31 Dec 2012 10:08:53 +0100
>> 
>> Welcome to the R-help at r-project.org mailing list!
>> 
>> To post to this list, send your message to:
>> 
>> r-help at r-project.org
>> 
>> General information about the mailing list is at:
>> 
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> 
>> If you ever want to unsubscribe or change your options (eg, switch to
>> or from digest mode, change your password, etc.), visit your
>> subscription page at:
>> 
>> https://stat.ethz.ch/mailman/options/r-help/idliuxudong%40hotmail.com
>> 
>> 
>> You can also make such adjustments via email by sending a message to:
>> 
>> R-help-request at r-project.org
>> 
>> with the word `help' in the subject or body (don't include the
>> quotes), and you will get back a message with instructions.
>> 
>> You must know your password to change your options (including changing
>> the password, itself) or to unsubscribe without confirmation. It is:
>> 
>> lxd646253
>> 
>> Normally, Mailman will remind you of your r-project.org mailing list
>> passwords once every month, although you can disable this if you
>> prefer. This reminder will also include instructions on how to
>> unsubscribe or change your account options. There is also a button on
>> your options page that will email your current password to you.
> 
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Dear Xudong,

First of all, most attachments are stripped on r-help -- yours didn't make
it through either. Since you sent a separate e-mail to me personally (including
the attachment), I can see what you want to accomplish, but let's keep this
on the list.

Second, your mail to r-help contained the "welcome" message you
received when you signed up for the mailing list. That message also contained
your password (I removed that part from your message below). Maybe not such a
wise thing to do.

Now, regarding your question. You could just include the information from the
whole study and the two subgroups in the dataset and then use the forest()
function. However, for computing the overall estimate (in case you also want to
include this in the forest plot), you need to decide how that should be done. Do
you want to just count the results from whole study or just the two subsets?
(using the information from the whole study and the two subsets would be
double-counting and not appropriate). In either case, you could then pass the
respective data to rma(), compute the overall estimate, and add it to the forest
plot using the addpoly() function.

I suggest carefully studying:

?forest.default
?addpoly.default

and especially the examples. If you then get stuck, please provide minimal and
self-contained code that can be used as a starting point for a more specific
response.

Best,
Wolfgang

--   
Wolfgang Viechtbauer, Ph.D., Statistician   
Department of Psychiatry and Psychology   
School for Mental Health and Neuroscience   
Faculty of Health, Medicine, and Life Sciences   
Maastricht University, P.O. Box 616 (VIJV1)   
6200 MD Maastricht, The Netherlands   
+31 (43) 388-4170 | http://www.wvbauer.com   
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org]
> On Behalf Of LiuXudong
> Sent: Monday, December 31, 2012 10:21
> To: r-help at r-project.org
> Subject: [R] a problem for metafor package
> 
> Dear sir or madam
> 
> I want to know how to use "metafor"package do a meta anlysis, 
forest
> plot  show the results of whole study and  results of two subgroups
> like this the forest plot show in the attachment.
> 
> looking forword to your reply
> 
> Regards and Cheers
> 
> Xudong Liu
> 
> School of Public Health and Primary Care
> The Chinese University of Hong Kong
> Email: liuxudong at cuhk.edu.hk