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Categorical data, contd.

2.) Another type of categorical data is ordinal – that is, there is some natural order (the scores are not unrelated).

For example, if you score fruit size on a scale of 1-5, where 1 = smallest and 5 = biggest, a score of 2 means the fruit are larger than fruit scored 1. There is a relationship between the scores, a natural order.

For this kind of data you need an association test (e.g. Kendall’s tau statistic; Kendall 1938).