This slideshow from Scott St. George of the University of Minnesota, highlights the need to eliminate unwanted elements from graphs and charts. Using a range of examples to demonstrate what not to do and how to keep statistical graphics simple and to the point.
Sources
St. George, S. Eliminating Chartjunk, University of Minnesota. Retrieved from: http://www.slideshare.net/scottstgeorge/geog826010-eliminating-chartjunk
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