Bar charts with percentage labels but counts on the y axis

June 11, 2014

(This article was first published on socialdatablog » R, and kindly contributed to R-bloggers)

Bar charts and histograms are easily to understand. I often write for non-specialist audiences so I tend to use them a lot. People like percentages too, so a bar chart with counts on the y axis but percentage labels is a useful thing to be able to produce.

But how to do them in our graphics package of choice, ggplot? ggplot makes histograms by doing a stat transformation, stat_bin. Not sure whether this is a good design decision, rather than requiring the user to bin the data first, because it is harder to customise stat_bin to get what you want, in this case percentage labels.



geom_bar(aes(y = (..count..)),fill="orange")+
geom_text(aes(y = (..count..),label =   ifelse((..count..)==0,"",scales::percent((..count..)/sum(..count..)))), stat="bin",colour="darkgreen") 




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