Testing for Structural Breaks at Unknown Time: A Steeplechase
Makram El-Shagi, Sebastian Giesen
Abstract
This paper analyzes the role of common data problems when identifying structural breaks in small samples. Most notably, we survey small sample properties of the most commonly applied endogenous break tests developed by Brown, Durbin, and Evans (1975) and Zeileis (2004), Nyblom (1989) and Hansen (1992), and Andrews, Lee, and Ploberger (1996). Power and size properties are derived using Monte Carlo simulations. Results emphasize that mostly the CUSUM type tests are affected by the presence of heteroscedasticity, whereas the individual parameter Nyblom test and AvgLM test are proved to be highly robust. However, each test is significantly affected by leptokurtosis. Contrarily to other tests, where skewness is far more problematic than kurtosis, it has no additional effect for any of the endogenous break tests we analyze. Concerning overall robustness the Nyblom test performs best, while being almost on par to more recently developed tests in terms of power.
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Neoclassical versus Keynesian approaches to Eastern German unemployment: a rejoinder to Merkl and Snower
Udo Ludwig, John B. Hall
Journal of Post Keynesian Economics,
No. 1,
2008
Abstract
This rejoinder contrasts a Keynesian approach for explaining unemployment in Germany’s eastern region with a neoclassical, market-failure approach advanced by Christian Merkl and Dennis Snower: A skewed distribution of headquarters favoring the western region, combined with insufficient levels of effictive demand for output – and subsequently for labor – are argued to be the key causes of persistent unemployment. Seven tables offer a comparative approach to output, investment, and labor demand in Germany’s eastern and western regions, noting the emergence and persistence of „involuntary“ unemployment appearing as a jobs‘ gap in the eastern region, especially for services.
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