hadley wickham wrote: >> > I was interested to see that you have code for drawing scatterplots > with multiple y-axes. As far as I know the only legitimate use for a > double-axis plot is to confuse or mislead the reader (and this is not > a very ethical use case). Perhaps you have a counter-example? > > Hadley > While it is true that the double-Y-axis graph is generally considered sinful, it can be used effectively to show the relation of two time series in ways that other graphs can't do as well.
For one striking example, a political, presentation graphic, see: http://www.math.yorku.ca/SCS/Gallery/images/commonsenserevolution6.pdf described on my Graphical Excellence page, http://www.math.yorku.ca/SCS/Gallery/excellence.html I found it easy to excuse the sin by the 'wow effect' produced by the graph. Playfair also used double-Y-axis graphs for similar purposes; and, sinner that he was, graphic and otherwise, he was not adverse to jiggling the scales on one or the other axes to make his message more apparent. See: @ARTICLE{FriendlyDenis:05:scat, author = {M. Friendly and D. Denis}, title = {The early origins and development of the scatterplot}, journal = {Journal of the History of the Behavioral Sciences}, year = {2005}, volume = {41}, pages = {103--130}, number = {2}, url = {http://www.math.yorku.ca/SCS/Papers/friendly-scat.pdf} } -- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. York University Voice: 416 736-5115 x66249 Fax: 416 736-5814 4700 Keele Street http://www.math.yorku.ca/SCS/friendly.html Toronto, ONT M3J 1P3 CANADA ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
