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This is a method of dividing the data displayed in a choropleth map. The Natural breaks (Jenks) method groups similar values together, and breaks are assigned where there are relatively large distances between the classes. This reduces variance within classes and maximises variance between classes. See also Equal interval and Quantile.
This is a type of categorical variable that represents categories that do not have a natural order. The values assigned to the categories can be presented in any order. For example, there is no natural order to a set of categories describing the religion a person might follow.
Non-substantive responses in surveys are responses such as: ‘Not sure/ Do not recall’, ‘Don’t know (DK)’. Non-substantive responses are generally not used in analysis.