Sometimes, we might wish to change the definition of outliers in our dataset by changing the extent of the whiskers. In this recipe, we will learn how to adjust the extent of whiskers in a box plot by passing a simple argument.
We will continue using the base graphics library functions, so we need not load any additional library or package. We just need to run the recipe code at the R prompt. We can also save the code as a script to use it later. Here, we will use the metals.csv example dataset again:
metals<-read.csv("metals.csv")Let's draw the metal concentrations box plot with the whiskers closer to the box than the default one in the preceding recipe:
boxplot(metals[,-1], range=1,border = "white",col = "black", boxwex = 0.3,medlwd=1,whiskcol="black", staplecol="black",outcol="red",cex=0.3,outpch=19, main="Summary of metal concentrations by Site \n (range=1) ")
