On Mar 30, 2011, at 5:10 PM, philsen wrote:
Dear list,
I am new to R and trying to create a grouped (four groups) scatter
plot with error bars (only in y-direction) using the scatterplot()
function from the car package.
The code I am using for plotting the scatter plot is:
scatterplot(a$s_profile~a$s_plot | a$group, data=a)
which gives me a nice grouped scatter plot. However I have no idea
how to insert error bars. Using errbar() from the Hmisc Package
gives some unwanted results, e.g. adding new points with an offset
in xy(!?) even when specifying the xlim/ylim parameters.
Generally people use the arrows function for error bars when working
in base graphics.
Another problem is to move/orientate the plotted legend
individually, is there any possibility?
I would appreciate your help in solving my problems.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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