Wine production in New Zealand
Use this example to explain the need to think carefully about the variables to tabulate (and display graphically).
The column showing total wine production is useful but hides an important trend. Click Show yield to add columns with the area used for wine production and the ratio of production to area. Use the '-' button to decrease the number of decimals to one — two significant digits are enough to assess the trend.
The table shows the area devoted to wine production (hectares) and the total yield of wine (tonnes) in New Zealand between 1986 and 2001.