5.1 Data used in the article

The data sets used in the article are:

• House prices in Melbourne.
  The article used a subset only: houses (i.e., Type == "h") in Essendon (i.e., Suburb == "Essendon").
• Diameter of pizzas.
• Sales of electric cars in Australia
• Ages of Prime Ministers and Presidents on taking office
• Monthly chocolate production in Australia
• Quarterly chocolate production in Australia