[R-meta] Ratio of Means
Viechtbauer Wolfgang (SP)
wolfgang.viechtbauer at maastrichtuniversity.nl
Tue Jul 25 13:06:33 CEST 2017
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
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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