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< u > Introduction to Econometrics </ u >, New York: Wiley .</ ref > While, strictly speaking, two-and higher-dimensional data sets are " multi-dimensional ," the term " multidimensional " tends to be applied only to data sets with three or more dimensions.

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< u > Introduction to Econometrics </ u >, New York: Wiley .</ ref > The data are usually collected over time and over the same individuals and then a regression is run over these two dimensions.

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