[R-meta] Ratio of Means

Viechtbauer Wolfgang (SP) wolfgang.viechtbauer at maastrichtuniversity.nl
Tue Jul 25 13:06:33 CEST 2017

I've updated:


It now shows how to get the regression of the underlying effects and also how to draw the confidence ellipse.

The 5.99 comes from qchisq(.95, df=2).

Note that the ellipse in the paper (Figure 5) seems to be drawn incorrectly.


Wolfgang Viechtbauer, Ph.D., Statistician | Department of Psychiatry and    
Neuropsychology | Maastricht University | P.O. Box 616 (VIJV1) | 6200 MD    
Maastricht, The Netherlands | +31 (43) 388-4170 | http://www.wvbauer.com    

-----Original Message-----
From: Nathan Pace [mailto:n.l.pace at utah.edu] 
Sent: Tuesday, July 25, 2017 07:42
To: Viechtbauer Wolfgang (SP); Michael Dewey; r-sig-meta-analysis at r-project.org
Subject: Re: [R-meta] Ratio of Means

Thanks to Gerta, Wolfgang, Michael, and James for comments and pointers to functions and codes.

In my data set the slope is one (0.97 +/- 0.04).

The QE for residual heterogeneity is very large (~30000).

In van Houwelingen (page 605, Figure 5) a coverage ellipse is plotted for vaccination data.

An equation is shown in the figure legend.

I don’t understand the source of the constant (5.99) on the rhs.



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