[R] Showing which bars in a bar chart are significantly different

[John Kane]

# Incremental approach 
bb <- c(23, 45, 67)
bsp  <- barplot(bb,beside=TRUE) # get midpoints of the bars and plot

# draw lines
segments( .7, 50, 1.9, 50)
segments(.7, 50, .7, 48)
segments(1.9, 50, 1.9, 48)

# Or all in one go

segments(c(.7, .7, 1.9), c(50,50,50), c(1.9,.7,1.9), c(50, 48, 48))

--- On Wed, 7/6/11, omernevo <nevo84 at gmail.com> wrote:

> From: omernevo <nevo84 at gmail.com>
> Subject: [R] Showing which bars in a bar chart are significantly different
> To: r-help at r-project.org
> Received: Wednesday, July 6, 2011, 4:37 PM
> Hello,
> 
> a probably rather stupid question to which I can't find an
> answer:
> 
> I have a bar chart, and I want to present which bars are
> significantly
> different by placing a line with an asterisk above then
> (similarly to fig. 3
> in: http://jnm.snmjournals.org/content/46/4/574.figures-only).
> 
> Does anyone have a reference where can I find some
> instructions how to learn
> this?
> 
> Thanks a lot!
> Omer
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Showing-which-bars-in-a-bar-chart-are-significantly-different-tp3649897p3649897.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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