1. Education
Cointegration
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Definition of Cointegration: "An (n x 1) vector time series yt is said to be cointegrated if each of the series taken individually is ... nonstationary with a unit root, while some linear combination of the series a'y is stationary ... for some nonzero (n x 1) vector a."

Hamilton uses the phrasing that yt is cointegrated with a', and offers a couple of examples. One was that although consumption and income time series have unit roots, consumption tends to be a roughly constant proportion of income over the long term, so (ln income) minus (ln consumption) looks stationary. (Econterms)

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