I'm sure this is a very simple question for most of you, but I'm new and can't figure it out. How do you create a side by side box plot grouped by time? For example, I have 24 months of data. I want to make one box plot for the first 12 months, and another for the second 12 months. My data can be seen below.
Since your data has a time ordering, it might be illuminating to plot line plots by month for each year separately. Here is code for both a line plot and a boxplot. I just made up the year values in the code below, but you can make those whatever is appropriate:
library(ggplot2) # Assuming your data frame is called "dat" dat$Month.abb = month.abb[rep(1:12,2)] dat$Month.abb = factor(dat$Month.abb, levels=month.abb) dat$Year = rep(2014:2015, each=12) ggplot(dat, aes(Month.abb, Revenue, colour=factor(Year))) + geom_line(aes(group=Year)) + geom_point() + scale_y_continuous(limits=c(0,max(dat$Revenue))) + theme_bw() + labs(colour="Year", x="Month") ggplot(dat, aes(factor(Year), Revenue)) + geom_boxplot() + scale_y_continuous(limits=c(0,max(dat$Revenue))) + theme_bw() + labs(x="Year")