41 An Exploratory Study on Removing Environmental and Operational Effects Using a Regime-Switching Cointegration Method 335 Fig. 41.5 Upper panel: natural frequency series rearranged in the order of temperature; Lower panel: temperature series rearranged in the order of magnitude Fig. 41.6 ADF statistics plot of the training sample points, the lowest point position determines the breakpoint position for the regime switch
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