A structural break is a concept in econometrics. A structural break appears when we see an unexpected shift in a (macroeconomic) time series. This can lead to huge forecasting errors and unreliability of the model in general. This issue was popularised by David Hendry. ==Test== In general, the CUSUM (cumulative sum) and CUSUM-sq (CUSUM squared) te...
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http://en.wikipedia.org/wiki/Structural_break
A structural change detected in a time series sample. Contexts: time series; econometrics
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http://www.econterms.com/glossary.cgi?query=structural+break
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