R help - Feb 2011 - add error bars in a plot

Dear all

I have a dataset of how metal concentrations change through time. I have made a
plot of date versus metal concentration. However I want to add error bars in the
plot.

Could you help me?

Thanks
Maria

	[[alternative HTML version deleted]]

Hello, Maria,

take a look at

?errbar

in the package Hmisc.


Hth  -- Gerrit

> Dear all
>
> I have a dataset of how metal concentrations change through time. I have 
> made a plot of date versus metal concentration. However I want to add 
> error bars in the plot.
>
> Could you help me?
>
> Thanks
> Maria

Hi Maria,

Instead of using errbar(), you can use the segments command which may be more
flexible. Following the example on p.80 (the errbar command) of
http://cran.ma.ic.ac.uk/web/packages/Hmisc/Hmisc.pdf

set.seed(1)
x=1:10
y=x+rnorm(10)
delta=runif(10)


barwidth=0.015
x11();plot(x,y)
segments(x,y-delta,x,y+delta)
segments(x-barwidth,y+delta,x+barwidth,y+delta)
segments(x-barwidth,y-delta,x+barwidth,y-delta)

Best,
Toby

________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On
Behalf Of Gerrit Eichner [Gerrit.Eichner at math.uni-giessen.de]
Sent: 09 February 2011 07:45
To: Lathouri, Maria
Cc: r-help at r-project.org
Subject: Re: [R] add error bars in a plot

Hello, Maria,

take a look at

?errbar

in the package Hmisc.


Hth  -- Gerrit

> Dear all
>
> I have a dataset of how metal concentrations change through time. I have
> made a plot of date versus metal concentration. However I want to add
> error bars in the plot.
>
> Could you help me?
>
> Thanks
> Maria
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and provide commented, minimal, self-contained, reproducible code.

> > I have a dataset of how metal concentrations change through time. I
have
> > made a plot of date versus metal concentration. However I want to add 
> > error bars in the plot.
> >
<http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-put-error-bars-or-confidence-bands-on-my-plot_003f>

  cheers
     Ben Bolker