[R] split a y-axis to show data on different scales

Spencer Graves spencer.graves at pdf.com
Mon Aug 14 18:14:42 CEST 2006

	  The pro's and con's of using "scale breaks" were discussed by 
Cleveland (1985) The Elements of Graphing Data (Wadsworth, pp. 85-91, 
149).  I don't know what Cleveland said about this is the second edition 
of this book, but I believe there are times when scale breaks are 
appropriate, but the display should make this nonstandard transition 
very clear;  otherwise, it can be seriously misleading.

	  Hope this helps.
	  Spencer Graves

Jim Lemon wrote:
> Rashmi Mathur wrote:
>> Hello,
>> How do I split a y-axis to plot data on different scales?
>> Eg:
>> x <- 1:10
>> y <- c(-0.01,0.79,0.74,0.55,-0.67,0.32,-0.47,-0.05,723,759)
>> plot(x,y)
>> I'd like to show these data on the same plot, but the way it's written, all
>> contrast in the first 8 data points is lost.  Can R split a y-axis for me?
> Hi Rashmi,
> Although Hadley's answer is relevant (displaying vastly different ranges 
> of data can be dangerous) you might find that gap.plot in the plotrix 
> package will do the dirty deed.
> Jim
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