African calorie intake in 1993 and 1998
Use this diagram to explain that it is important to think carefully about what variables to display or analyse. Sometimes a ratio or difference between variables is more meaningful.
Select 1993 cals and 1998 cals from the pop-up menu to display these variables on the map. The maps highlight effectively highlight places with worst nutrition. However a different aspect of the data can be seen by defining a new variable %Increase:
%Increase = 100 × | 1998 calories − 1993 calories |
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1993 calories |
Select %Increase from the pop-up menu to see which countries have improved their calorie intake between 1993 and 1998.
(Also see the other related examples in the General and Business versions of this page — click the triangle at the top right of this page to select alternative versions of any page.)