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...lways every other 28 days. So the difference between 2 successive dates is not always 28 days but 35 is some cases or otherwise. Put differently, I have "jumps". I would like to visualize these characteristics of the series of dates by making a plot similar to http://i46.tinypic.com/2h7gpvn.png But this is not enough. I want to measure the distance between 2 successive knots (the difference between 2 successive dates) and note on the plot the number of weeks that separate apart the successive knots-dates Something like http://www.survey-design.com.au/stripplot3.png where as you ca...