[R-meta] Meta analysis subgroups

[Michael Dewey]

Dear Julie

Unless the primary studies give you that information I think you are out 
of luck (or I completely misunderstand what you are trying to do).

Michael

On 05/09/2019 15:29, Julie Webbs wrote:
> Thank you,  Wolfgang
> 
> Would you help to do it? How I can do it using metafore?
> 
> Many thanks
> Julie
> 
> On Thu, Sep 5, 2019 at 12:43 PM Viechtbauer, Wolfgang (SP) <
> wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:
> 
>> Hi Julie,
>>
>> If that is the hypothesis, then looking at the association between the SMD
>> for X and the SMD for Y doesn't answer it. You should be looking at the
>> association between X and Y within each study (and group) directly.
>>
>> Best,
>> Wolfgang
>>
>> -----Original Message-----
>> From: Julie Webbs [mailto:webbsjulie using gmail.com]
>> Sent: Thursday, 05 September, 2019 9:14
>> To: Viechtbauer, Wolfgang (SP)
>> Cc: Michael Dewey; r-sig-meta-analysis using r-project.org
>> Subject: Re: [R-meta] Meta analysis subgroups
>>
>> Thank you,  Wolfgang
>>
>> The research hypothesis is that the variable Y does not affect the
>> variable X. Or does the variable Y  affect the variable X?
>>
>> Hope this clears things up.
>>
>> Best Wishes,
>> Julie
>>
>> On Wed, Sep 4, 2019 at 9:59 PM Viechtbauer, Wolfgang (SP) <
>> wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:
>> Hi Julie,
>>
>> You have clarified the data structure, but I personally still have no idea
>> what you mean by: "Now I want to run a met-analysis for X differences
>> associated with Y." What exactly do you mean by that? What is your research
>> question/hypothesis?
>>
>> Best,
>> Wolfgang
>>
>> -----Original Message-----
>> From: R-sig-meta-analysis [mailto:
>> r-sig-meta-analysis-bounces using r-project.org] On Behalf Of Julie Webbs
>> Sent: Thursday, 29 August, 2019 17:00
>> To: Michael Dewey
>> Cc: r-sig-meta-analysis using r-project.org
>> Subject: Re: [R-meta] Meta analysis subgroups
>>
>> Dear Michael
>>
>> Thank you for your email. and sorry about that.
>>
>> I have to variables, say X and Y.
>>
>> 1. The X has two categories, let's say  a and b, so you  can calculate
>> Mean and SD for group a and group b.
>>
>> 2. The Y has two categories, let's say c and d. So you can calculate Man
>> and SD for group a and group d.
>>
>> I have run a meta-analysis separately for both X and Y using the meta
>> package.
>>
>> Now I want to  run a met-analysis for  X differences associated with Y. Is
>> it possible? or I need to consider other statistical procedures?
>>
>> Here is the excel file
>>
>> Thank you
>> Julie
>>
>> On Thu, Aug 29, 2019 at 1:28 PM Michael Dewey <lists using dewey.myzen.co.uk>
>> wrote:
>> Dear Julie
>>
>> Sorry bit that does not make much sense to me. See comments in-line
>>
>> On 28/08/2019 21:42, Julie Webbs wrote:
>>> Dear All
>>>
>>> I have two continuous variables and each has two categories as follows:
>>
>> If they are continuous then they do not have categories so I am at a
>> loss here.
>>
>>> X = a and b
>>> Y= c and d
>>>
>>> I have calculated  the standardised mean difference (SMD)  for  *X* and
>> *Y
>>> using meta-analysis.*
>>> I want to calculate *X* differences associated with *Y*.
>>
>> That also seems opaque here.
>>
>>> Would you please advise me how I can do it. Here is a sample of data.
>> Thank
>>> you, Julie
>>
>> I am afraid your data-set did not arrive here well since you posted in
>> HTML and such posts get mangled when they pass through the list. It
>> might also help if you posted an example of what the differences you are
>> seeking would look like.
>>
>>> X Y
>>> Mean SD Mean SD Mean SD Mean SD
>>> a a b b c c d d
>>> 12 1 14 2 10 0.3 18 0.1
>>> 11 2 13 0.5 11 0.1 14 0.3
>>> 10 1 12 1 14 1 16 0.2
>>
> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html