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.

Another problem is to move/orientate the plotted legend individually, is there any possibility?

I would appreciate your help in solving my problems.

Many thanks in advance,
Philip

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