[R-meta] Meta analysis subgroups

[Julie Webbs]

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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