| funnelplot {rmeta} | R Documentation |
Plots the treatment difference for trials against the size of the trial (or other specified variable). Asymmetry in the plot often indicates publication bias. Generic, with methods for meta-analysis objects.
funnelplot(x,...)
funnelplot.default(x, se, size=1/se, summ=NULL,
xlab="Effect", ylab="Size", colors=meta.colors(),
conf.level=0.95, plot.conf=FALSE,
zero=NULL, mirror=FALSE, ...)
x |
Treatment difference |
se |
Standard error of x |
size |
Variable for the vertical axis |
summ |
summary treatment difference |
xlab |
x-axis label |
ylab |
y-axis label |
colors |
list of colors for components of the plot |
conf.level |
For confidence interval plotting |
plot.conf |
Plot confidence intervals instead of just points? |
zero |
location of a null hypothesis line |
mirror |
Add points reflected around summ? |
... |
further arguments to be passed from or to methods. |
With the default value of size the plot should appear as a
upwards-pointing funnel shape. Publication bias often causes one side
of the funnel to be trimmed near the base. The mirror plot
creates a symmetric funnel by reflecting the plot around the
summ value. In the presence of publication bias the added
points will separate from the real studies.
Used for its side-effect.
Thomas Lumley
meta.DSL,
meta.MH,
meta.summaries,
metaplot
data(catheter)
a <- meta.MH(n.trt, n.ctrl, col.trt, col.ctrl, data=catheter,
names=Name, subset=c(13,6,5,3,7,12,4,11,1,8,10,2))
funnelplot(a$logOR, a$selogOR)
funnelplot(a$logOR, a$selogOR,
plot.conf=TRUE, summ=a$logMH, mirror=TRUE)
funnelplot(a, plot.conf=TRUE)