[R] CI wiskers

[John Kane]

Or a simple approach is to use arrows to draw the CI whiskers

Example
======================================================================
# Uses arrows to produce confidence intervals for a set of values.
low  <- c(312.9460, 312.9419, 312.9422, 312.9380 )
mass <- c(312.9476, 312.9435, 312.9438 , 312.9396 )
high  <- c(312.9492, 312.9451, 312.9454, 312.9412)

yaxis <- seq(1,4,by=1)
plot(x = mass, y = yaxis, pch=17, xlim = c(312.9378,312.9500), axes=FALSE,
     xlab = 'mass', ylab = '', main = 'Mass/Intensity Problem')
labs <- seq(312.8, 312.95, by = 0.0005)
axis(1, at = labs, labels = labs)
axis(2, at = yaxis, las = 2)

arrows(x0 = low, x1 = high, y0 = yaxis, y1 = yaxis,
length=0.1, code = 3, col = 4, angle = 90)
box()
==========================================================================


--- On Fri, 7/24/09, Dieter Menne <dieter.menne at menne-biomed.de> wrote:

> From: Dieter Menne <dieter.menne at menne-biomed.de>
> Subject: Re: [R] CI wiskers
> To: r-help at r-project.org
> Received: Friday, July 24, 2009, 11:43 AM
> 
> 
> 
> mfreidin wrote:
> > 
> > I have a matrix containing means and CIs (lower and
> upper in two columns,
> > so three columns for every data point) for several
> points. I have to build
> > a graph of these means accompained by the CIs (as
> wiskers). No problems
> > with making the graph of means, but I don't know how
> to introduce CIs. 
> > 
> 
> xYplot in package Hmisc (not the uppercase Y)
> 
> Dieter
> 
> 
> -- 
> View this message in context: http://www.nabble.com/CI-wiskers-tp24646309p24646905.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
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> 


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