- The markdown file for the entire chapter: intro.Rmd or intro-tidy.Rmd
- The pdf file with outputs: intro.pdf or intro-tidy.pdf
- The R script file for the entire chapter: intro.R or intro-tidy.R
- The script used in Section 1.3.8: UNpop.R or UNpop-tidy.R
- World population estimates data (Table 1.2): UNpop.csv, UNpop.RData, UNpop.dta
- US election turnout data (Table 1.3): turnout.csv
- Fertility and Mortality estimates data (Table 1.4): World.csv, Kenya.csv, Sweden.csv