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Categorical variables represent a group or category.
Numerical variables represent a quantity.
Continuous data is measured.
Discrete data is counted.
Numerical data is data that has been assigned a numeric value. Numerical data can be:
• discrete — data that can be counted but that can have only a particular value, for example the number of pieces of fruit in a bowl
• continuous — data that is not restricted to any particular value, for example the temperature outside, which is measured on a continuous scale.
Categorical data is data split into two or more categories. Categorical data can be:
• nominal — data that can be arranged into categories but not ordered, for example arranging shoes by colour or athletes by gender
• ordinal — data that can be arranged into categories that have an order, for example levels of education from high school to post-graduate degrees.
Categorical data is not always non-numeric. As examples, if we were interested in the age group of spectators at a football match we would use categories such as <10, 10–20 etc., or we might be interested in ranking a statement on a scale from 1 (strongly agree) to 5 (strongly disagree).
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