[R] adding lines to stripchart

From: James Root <jcroot_at_gmail.com>
Date: Sun, 24 Jun 2007 18:12:30 -0400

I have two points of collection across 20 subjects (pre and post for each), so 20 pairs of data points. I would like to plot the actual raw data points for each subject for both pre and post and connect lines between these two points (20 in all) to depict real change between the two timepoints.

I have tried using stripchart which adequately plots the two lines of subject data points. Attempting to use segments however has been difficult. It seems that the segments command gives too many coordiate points - so where segments has:

x0, y0, x1, y1

I really only have two coordinates for each point -

pre to post

I am sure that I am misusing the command but not sure if I should continue to try with segments or if there is another command that would be more appropriate.

As always, thanks for any help.

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