[R] refline in forest() {metafor}

[Viechtbauer Wolfgang (STAT)]

Regarding your question: Do you want *another* line or do you just want to move the reference line to the value of the summary estimate? The latter can be done by passing the value of the summary estimate to the 'refline' argument. If you want another line, you could just use the abline function, or, for finer control, the segments function. Something like:

segments(coef(res), 0, coef(res), res$k, lty="dashed")

where 'res' is the name of the fitted model object. You may have to play around with the 0 and res$k values, so that the line has the 'correct' length.

Thanks for the positive feedback about the package.

Best,
Wolfgang

--
Wolfgang Viechtbauer, Ph.D., Statistician
Department of Psychiatry and Psychology
School for Mental Health and Neuroscience
Faculty of Health, Medicine, and Life Sciences
Maastricht University, P.O. Box 616 (VIJV1)
6200 MD Maastricht, The Netherlands
+31 (43) 388-4170 | http://www.wvbauer.com
________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of johnwilliams at fas.harvard.edu [johnwilliams at fas.harvard.edu]
Sent: Thursday, December 12, 2013 6:49 AM
To: r-help at r-project.org
Subject: [R] refline in forest() {metafor}

Hello all,

I am using forest.rma to plot a random effects model meta-analysis. I noticed
that refline sets a vertical line indicating the null hypothesis.

Is there a way to draw another vertical line, possibly dashed, centered on the
summary estimate?

Prof. Viechtbauer, if you happen to read this, I'd like to thank you for making
an excellent package. I have been using the metafor package to do my first
meta-analysis, having never used R before. The documentation is thorough and
intuitive.

Thanks,

John

John Williams
ALB Candidate
Harvard University Extension School
johnwilliams at fas.harvard.edu

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