Changing whisker end in geom_boxplot

Question

geom_boxplot

I am trying to use geom_boxplot to draw picture. However, I want to change the definition of whisker, which means that the end of the whisker is the max and min of my data, and outlier should be removed. It would be nice to base on my exist code.

Thank you very much.

con.for2=data.frame(d=as.character(gl(9,20)),close=exp(rnorm(180)),open=exp(rnorm(180)))
concentration=melt(con.for2)
colnames(concentration)=c("location","Condition","formaldehyde")
p=ggplot(data=concentration,aes(factor(location), formaldehyde),ylim=c(0,0.15),cex.axis=1.5,cex.lab=15
         ) + geom_boxplot(aes(fill = Condition))+xlab("Location") + ylab("Formaldehyde concentration (mg/m3)")

At the very end of the help page for geom_boxplot there is an example of using stat="identity" to override the standard settings. You could set up another df with the appropriate figures for your data, and use this approach. — Andrew Gustar

Adam Quek Adam Quek · Accepted Answer · 2017-05-25T09:26:40

Adapted from the answer Changing whisker definition in geom_boxplot

 p <- ggplot(data=concentration,aes(factor(location), formaldehyde),ylim=c(0,0.15),cex.axis=1.5,cex.lab=15)

f <- function(x) {
  r <- quantile(x, probs = c(0, 0.25, 0.5, 0.75, 1))
  names(r) <- c("ymin", "lower", "middle", "upper", "ymax")
  r
}

p + stat_summary(fun.data=f, aes(fill= Condition), geom="boxplot", position="dodge")

Changing whisker end in geom_boxplot

1 Answers