Related to:
- Choropleth map
- classes - Categorical variable
- Histogram
- plethora/Plethos = Magnitude
A plethora of classification approaches are available. Understanding the impact of different methods is an important development in map literacy. To kick-off, let’s look at two of the most well-known and well-used methods.
- Equal interval – ensures evenly spaced gaps between the class breaks.
- Equal count (“quantile”) method - ensures the same number of map areas are allocated to each class.
Smith, Alan. How Charts Work (p. 187). Pearson Education. Kindle Edition.
It’s also a good idea to give the reader a visual clue about how the class breaks are distributed across the range of values.
Smith, Alan. How Charts Work (p. 191). Pearson Education. Kindle Edition.