The dataframe once you load it into R looks like the following:

setwd("/Users/bgpopescu/Dropbox/john_cabot/teaching/big_data/week4/data/")#Step1: Loading the datalife_exp_urb <-read.csv(file ='./life_exp_urb.csv')#Step2: Examining the first five entrieshead(life_exp_urb, n=5)

“Graphical excellence is the well-designed presentation of interesting data—a matter of substance, of statistics, and of design … [It] consists of complex ideas communicated with clarity, precision, and efficiency.[…] [It] is that which gives to the viewer the greatest number of ideas in the shortest time with the least ink in the smallest space… And graphical excellence requires telling the truth about the data.”

Edward Tufte, The Visual Display of Quantitative Information, p. 51