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I'm going over the different types of attributes in data-mining (nominal, ordinal, discrete, etc) and there is one example in the book that states that the density of a substance in grams per cubic centimeter is a discrete attribute. Why is this? I confuses me that this is the case but it also says that the distance from the center of campus is continuous.

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The book is wrong. Density is continuous. It could be any real number. You are quite right.

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