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Dynamic factor : ウィキペディア英語版 | Dynamic factor In econometrics, a dynamic factor (also known as a diffusion index) is a series which measures the co-movement of many time series. It is used in certain macroeconomic models. Formally : where is the vector of lagged factors of the variables in the matrix (T is the number of observations and N is the number of variables), are the factor loadings, and is the factor error. == History == Diffusion indexes were originally designed to help identify business cycle turning points.〔Getz and Ulmer, p. 14, footnote 2 citing Geoffrey Moore, 1950, "Occasional Paper 31," Cambridge, MA: National Bureau of Economic Research.〕
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