You may sometimes come across this term. It is a type of categoric variable whose values are restricted to whole numbers. For example, the number of carbon atoms in a chain. e.g. Dave's office is too hot so he designs a fan to cool himself down. He tries out different numbers of blades attached to a motor. The number of blades can only vary by a whole number: 1, 2, 3, etc. So this variable is discrete. N.B. Don't write about discreet variables – this has a very different meaning!
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