[R-sig-ME] Dependence of Effect Sizes in meta analysis metafor (some statistical theory questions included)

[Drwecki, Brian B]

Thanks all, 

You've given me a lot of reading to do!  Thank you.   I'll post my final model just for the sake of those who come after me and who search the archive.  


BBD



On Jun 27, 2015, at 12:50 AM, Theodore Lytras <thlytras at gmail.com> wrote:

> Στις Σαβ 27 Ιουν 2015 06:05:39 Drwecki, Brian B έγραψε:
>> Hello all,
>> 
>> I apologize for the long post, but I want to be thorough.
>> 
>> My Goal: To conduct the appropriate mixed-effects (random effects meta
>> analysis model+ one fixed effects moderator with two categorical levels)
>> meta analysis where 11 of 38 papers/studies present effects for both levels
>> of my Fixed Effects moderator (i.e. these 11 studies provide 2 effect sizes
>> each =  22 total estimates; each pair of effects is dependent and violates
>> assumptions of independence).
> [snip, snip]
> 
> Hello,
> 
> Maybe you can check package "robumeta" and the associated paper: 
> 
> Hedges LV, Tipton E, Johnson MC. Robust variance estimation in meta-regression 
> with dependent effect size estimates. Res Synth Method. 2010;1(1):39–65. 
> http://onlinelibrary.wiley.com/doi/10.1002/jrsm.5/abstract
> 
> I've recently dealt with a similar meta-analysis situation, with hierarchical 
> dependence (multiple effect estimates clustered within the same study), and 
> this approach worked well for me.
> 
> As a plus, you can have "robumeta" play nice ball with "metafor":
> 
> http://blogs.edb.utexas.edu/pusto/2014/04/21/a-meta-sandwich/
> 
> Hope this helps!
> 
> Kind regards,
> 
> Theodore Lytras
> 
>