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For each X-value I calculated the average Y-value and the standard deviation (sd) of each Y-value
x = 1:5 y = c(1.1, 1.5, 2.9, 3.8, 5.2) sd = c(0.1, 0.3, 0.2, 0.2, 0.4) plot (x, y) How can I use the standard deviation to add error bars to each datapoint of my plot?
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Adding error bars (whiskers) with stat_boxplot The default box plot in ggplot doesn't add the error bar lines, but you can add them with stat_boxplot , setting geom = "errorbar" . Note that you can change its width with width .
A solution with ggplot2 :
qplot(x,y)+geom_errorbar(aes(x=x, ymin=y-sd, ymax=y+sd), width=0.25) 
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