Acquiring msleep

Install package downloader if have not already

library(downloader)

## Warning: package 'downloader' was built under R version 3.4.4

url <- "https://raw.githubusercontent.com/genomicsclass/dagdata/master/inst/extdata/msleep_ggplot2.csv"
filename <- "msleep_ggplot2.csv"
if (!file.exists(filename)) download(url,filename)
msleep <- read.csv("msleep_ggplot2.csv")
knitr::opts_chunk$set(echo = TRUE)