[R] "metafor" package, proportions: single groups wrt to a categorical dependent variable

[Michael Dewey]

At 01:18 31/07/2012, Dushanthi Pinnaduwage wrote:

>Thanks very much for the reply Michael.
>I guess I have to combine some levels to  make categorical variable 
>to a binary variable.

Without knowing more about your outcome variable (you have not even 
told us yet whether it is ordered or not) it is a bit hard to offer 
more advice. I would regard collapsing categories as a last resort 
myself as you lose information.

>
>Dushanthi
>
>
> > Date: Sat, 28 Jul 2012 16:38:24 +0100
> > To: dushanthi at bell.net; r-help at r-project.org
> > From: info at aghmed.fsnet.co.uk
> > Subject: RE: [R] "metafor" package, proportions: single groups 
> wrt to a categorical dependent variable
> >
> > At 15:47 28/07/2012, Dushanthi Pinnaduwage wrote:
> > >
> > >Dear Michael,
> > >
> > >Thanks very much for your quick response.
> > >
> > >My outcome is not binary. Outcome has more than 2 values (levels)
> > >and I have counts for the levels.
> > >I have not written a code yet.
> >
> > Well as the name of the key function in metafor (rma.uni) suggests
> > metafor at present does univariate meta-analysis. If you can reduce
> > the outcome to a single measure of effect (perhaps using proportional
> > odds or continuation ratio) then you can enter that with its standard
> > error using the yi and sei parameters to rma.uni. If the nature of
> > your outcome does not allow that then you have a multivariate
> > meta-analysis. In that case you could try mvmeta (available from CRAN)
> >
> > >
> > >I would like to know if escalc() can handle categorical outcome data
> > >(more than 2 proportions). If so, how can I input
> > >the counts of each level of the categorical outcome to this function.
> > >
> > >Hope it is little clear now.
> > >
> > >Dushanthi
> > >
> > >
> > >
> > >You do not give us very much to go on here. When you say your outcome
> > > >is proportions do you mean your outcome has more than two values and
> > > > you are generating (or have been provided with) several proportions
> > > > for each study or do you mean it is a binary variable? If the latter
> > > > do you in fact have the numerators and denominators or just the
> > > > proportion? It would also help if you showed us the code you have
> > > > tried and the error message you got (if any) or told us the
> > > > discrepancy between the output you obtained and that which 
> you expected.
> > >
> > >
> > >
> > > > Date: Sat, 28 Jul 2012 14:25:08 +0100
> > > > To: dushanthi at bell.net; r-help at r-project.org
> > > > From: info at aghmed.fsnet.co.uk
> > > > Subject: Re: [R] "metafor" package, proportions: single groups
> > > wrt to a categorical dependent variable
> > > >
> > > > At 01:44 28/07/2012, Dushanthi Pinnaduwage wrote:
> > > >
> > > >
> > > >
> > > >
> > > > >Dear all, I am using R version 2.15.0 and 'metafor' package version
> > > > >1.6-0. Can this version of the package handle proportions from
> > > > >a categorical dependent variable for single studies?If so how do I
> > > > >set up my dataframe for the raw data from different studies? Also
> > > > >how do I give inputs, specially xi, mi (or ni) to the function
> > > > >escalc()? Thanks,Dushanthi
> > > >
> > > > You do not give us very much to go on here. When you say your outcome
> > > > is proportions do you mean your outcome has more than two values and
> > > > you are generating (or have been provided with) several proportions
> > > > for each study or do you mean it is a binary variable? If the latter
> > > > do you in fact have the numerators and denominators or just the
> > > > proportion? It would also help if you showed us the code you have
> > > > tried and the error message you got (if any) or told us the
> > > > discrepancy between the output you obtained and that which 
> you expected.
> > > >
> > > > >
> > > > > [[alternative HTML version deleted]]
> > > >
> > > > Michael Dewey
> > > > info at aghmed.fsnet.co.uk
> > > > http://www.aghmed.fsnet.co.uk/home.html
> > > >
> >
> > Michael Dewey
> > info at aghmed.fsnet.co.uk
> > http://www.aghmed.fsnet.co.uk/home.html
> >

Michael Dewey
info at aghmed.fsnet.co.uk
http://www.aghmed.fsnet.co.uk/home.html