[R-meta] double arcsine transformation

[Viechtbauer, Wolfgang (SP)]

Good point. And speaking of unsolicited advice -- concerns can be raised about the back-transformation itself:

https://onlinelibrary.wiley.com/doi/abs/10.1002/jrsm.1348

Best,
Wolfgang

-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-project.org] On Behalf Of Michael Dewey
Sent: Wednesday, 29 January, 2020 10:36
To: james meyer; r-sig-meta-analysis using r-project.org
Subject: Re: [R-meta] double arcsine transformation

Dear James

I know this is not what you asked but are you sure you want to do 
univariate analyses here? Although sensitivity and specificity are 
independent within study in general they are not independent between 
study. It may be that you have too few studies to do the bivariate 
analysis of course.

Michael

On 29/01/2020 01:15, james meyer wrote:
> I am performing a univariate meta-analysis on sensitivity and specificity.   I
> fit the model in metafor and when trying to transform the double-arcsine I get
> the following error:
> 
>   pes<-predict(pes.dat,transf.ipft.hm,targ=list(ni=dat$total))
> Error in predict.rma(pes.dat, transf.ipft.hm, targ = list(ni = dat$total)) :
>    Cannot specify new moderator values for models without moderators.
> 
> Is this fixable or do you need more information.
> 
> James C Meyer DVM DACVIM