[R-meta] Meta analysis subgroups

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 at r-project.org] On Behalf Of Julie Webbs
Sent: Thursday, 29 August, 2019 17:00
To: Michael Dewey
Cc: r-sig-meta-analysis at 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 at 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

Dear All

I have two continuous variables and each has two categories as follows:

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*.

Would you please advise me how I can do it. Here is a sample of data. Thank
you, Julie

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

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 at gmail.com]
Sent: Thursday, 05 September, 2019 9:14
To: Viechtbauer, Wolfgang (SP)
Cc: Michael Dewey; r-sig-meta-analysis at 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 at 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 at r-project.org] On Behalf Of Julie Webbs
Sent: Thursday, 29 August, 2019 17:00
To: Michael Dewey
Cc: r-sig-meta-analysis at 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 at 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

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 at 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 at gmail.com]
Sent: Thursday, 05 September, 2019 9:14
To: Viechtbauer, Wolfgang (SP)
Cc: Michael Dewey; r-sig-meta-analysis at 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 at 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 at r-project.org] On Behalf Of Julie Webbs
Sent: Thursday, 29 August, 2019 17:00
To: Michael Dewey
Cc: r-sig-meta-analysis at 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 at 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

	[[alternative HTML version deleted]]

Dear All

I have two continuous variables and each has two categories as follows:

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*.

Would you please advise me how I can do it. Here is a sample of data. Thank
you, Julie

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