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Practical Predictive Analytics by Ralph Winters

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Ordinal data

Ordinal data only has rank order. Statements can be made such as A>B and B < C, but you cannot compute the numeric differences between any of the groups. A top ten list is an example of the presentation of ordinal data. Often categorical data can be classified as ordinal data if they have an implied order, such as two categories labeled Better, and Best. One problem with ordinal data is we never know what is the exact difference between each of the ranked data points.

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