7.2 ggplot2

Draw the Indometh graph using ggplot2:

# First, activate the ggplot2 library
library(ggplot2)
ggplot(Indometh, aes(factor(time), conc, col = Subject, group = Subject)) + 
    geom_line() +
    labs(x = "Time (h)", y = "Concentration (mcg/ml)",
         title = "Indometh Pharmacokinetics") +
    theme(plot.title=element_text(size=20,face="bold"))

What’s happening here?

Function/Argument	Description
aes	sets the aesthetics of the plot. In this case, that we want to plot ’time’ on the x-axis (the factor), ’conc’ on the y-axis, and group and colour the lines by ’Subject’
goem_line()	specifies that this is a line plot
labs()	sets the x and y axis labels and the plot title
theme()	in this case defines the plot title as bold 24 point
+	plut signs at the end of the lines tells R that the command hasn’t finished and that it continues on the next line