[R-meta] Distinguishing between the design of longitudinal studies

[James Pustejovsky]

Hi Stefanou,

This is certainly an interesting question but I, for one, am at a loss as
to what advice to give. What moderators to include in your model depends
first and foremost on the research questions that you are investigating
through your meta-analysis and, second, on the substantive and
design-related features of the included studies. We on the listserv are not
in a very good position to offer guidance here, since we don't have the
context of or experience in your research area.

All that said, if you have thoughts or ideas for how to proceed with your
meta-analysis, you are of course certainly welcome to solicit feedback
through the listserv.

Kind Regards,
James

On Mon, Aug 23, 2021 at 12:57 AM Stefanou Revesz <stefanourevesz using gmail.com>
wrote:

> Dear List Members,
>
> We are meta-analyzing a number of longitudinal studies. But our
> studies have three general research designs (below).
>
> We are wondering, other than creating study-level moderators to
> distinguish between the designs or how many treatments each study uses
> etc., what *time-level* or *effect-size-level* moderators we should
> control for in our meta-analysis?
>
> First, we have studies that make an observation (o) prior to a
> treatment (x), and then, make follow-up observation(s):
>
> o x o o
> o    o o   <-- control group
>
> Second, we have studies that make an observation (o) prior to a
> treatment (x), then, make follow-up observation on that treatment, but
> then again introduce the treatment and make follow-up observation(s):
>
> o x o x o  o
> o    o    o  o  <-- control group
>
> Third, we have studies that make an observation (o) prior to
> successive treatments (x), and then, make follow-up observation(s) on
> those treatments:
>
> o x x x o  o
> o         o  o  <-- control group
>
> Thank you!
> Stefanou
>
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