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sitelist
2010 Jan 06
1
boxplot help
Dear Rexperts,
I am trying to add a '+' identifying the mean in a boxplot using the
following
sizelist <- split(size, grp)
centers <- boxplot(sizelist, style.bxp = "att", medpch = "o",
ylab = "Prostate Volume (cm3)")
points(centers, unlist(lapply(sizelist, mean)), pch = "+")
But, I get error
Error in xy.coords(x, y) : 'x' and &...