[R-meta] Ratio of Means

[Nathan Pace]

Hi,

In your metafor vignette (page 5), mu is defined as the estimate of the true log odds ratio.

Can predict.rma be used to estimate the cr.lb and cr.ub of mu?


Nathan

-----Original Message-----
From: "Viechtbauer Wolfgang (SP)" <wolfgang.viechtbauer at maastrichtuniversity.nl>
Date: Tuesday, July 25, 2017 at 05:06
To: "r-sig-meta-analysis at r-project.org" <r-sig-meta-analysis at r-project.org>
Cc: Nathan L Pace <n.l.pace at utah.edu>
Subject: RE: [R-meta] Ratio of Means

    I've updated:
    
    http://www.metafor-project.org/doku.php/analyses:vanhouwelingen2002
    
    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.
    
    Best,
    Wolfgang
    
    -- 
    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.
    
    Comments?
    
    Nathan