[R-meta] Choice of MA

[Michael Dewey]

Dear Jorge

I suspect opinions will differ here so my comments (in-line) shouls be 
taken with a pinch of salt.

Michael

On 19/03/2023 10:20, Jorge Teixeira via R-sig-meta-analysis wrote:
> Hi all. I am doing a SRMA in which most outcomes have just 4 or 5 studies.
> One of them has 4 arms (3 with the intervention of interest; 1 with CON).
> 
> 
> Questions:
> 
> 
> 1) Would you combine these 3 groups into one and do a standard MA or would
> you do a multi-level MA? Note: I have access to the database of the study
> with 4 arms.

Usually I would say do an NMA but with so few studies combining the 
intervention groups might be fine as long as they ae scientifically 
combinable.

> 
> 2) Side question: would you tend to not report funnel plots or Egger’s
> regression in this case?
>

I would not draw a funnel plot or do any of the regression tests.

> 
> 3) If I broaden my eligibility criteria and had 2 more studies, would your
> answers differ?
> 

Not more 2 more, no.

> 
> Thank you,
> 
> JT
> 
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> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html