Removing Non-stationarity
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Central Bohemia
Capital City of Prague
Liberec
Usti nad Labem
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Karlovy Vary
Zlin
Hradec Kralove
Pardubice
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South Moravia
Moravian-Silesian
Olomouc
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The diffrenced series: $$Y_{t}^{\prime}=Y_{t}-Y_{t-1} $$
Second-order diffrenced series: $$Y_{t}^{\prime\prime}=Y_{t}^{\prime}-Y_{t-1}^{\prime} $$