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I want to plot frequency distribution of an [r] factor variable as a bargraph, where bars represent the frequency counts of the factor levels. I use ggplot2 to do that and there's no problem with that.
What I can't figure out is how to add frequency count labels to the bars in the bargraph. The syntax that I've tried is as follows:
ggplot(data, aes(x = factorvar)) + geom_bar(fill = "somecolor") + geom_text(aes(y = ???))
I think I thoroughly searched in stackoverflow and "R Graphics Cookbook" by W.Chang but I couldn't find any specific answer to what parameter should I match to "y" in the aesthetics of geom_text() above. I tried some variants like: (y = ..count..) but it didn't work.
I would appreciate any help. Thanks...
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To add labels on top of each bar in Barplot in R we use the geom_text() function of the ggplot2 package. Parameters: value: value field of which labels have to display. nudge_y: distance shift in the vertical direction for the label.
By default, geom_bar uses stat="count" which makes the height of the bar proportion to the number of cases in each group (or if the weight aethetic is supplied, the sum of the weights). If you want the heights of the bars to represent values in the data, use stat="identity" and map a variable to the y aesthetic.
geom_bar() makes the height of the bar proportional to the number of cases in each group (or if the weight aesthetic is supplied, the sum of the weights).
ggplot(data=diamonds, aes(x=clarity)) + geom_bar() + geom_text(stat='count', aes(label=..count..), vjust=-1) 
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