Time series | Mathematical finance

Cointegration

Cointegration is a statistical property of a collection (X1, X2, ..., Xk) of time series variables. First, all of the series must be integrated of order d (see Order of integration). Next, if a linear combination of this collection is integrated of order less than d, then the collection is said to be co-integrated. Formally, if (X,Y,Z) are each integrated of order d, and there exist coefficients a,b,c such that aX + bY + cZ is integrated of order less than d, then X, Y, and Z are cointegrated. Cointegration has become an important property in contemporary time series analysis. Time series often have trends—either deterministic or stochastic. In an influential paper, Charles Nelson and Charles Plosser (1982) provided statistical evidence that many US macroeconomic time series (like GNP, wages, employment, etc.) have stochastic trends. (Wikipedia).

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Johansen test | Phillips–Perron test | Random walk | Stationary process | Time series | Order of integration | Ordinary least squares | Linear regression | Stationary subspace analysis | Unit root | Error correction model | Stochastic | Dickey–Fuller test | Granger causality | Structural break | Linear combination