Long Memory and Structural Breaks in Finnish and Swedish Party Popularity Series∗
نویسندگان
چکیده
A time series with a unit root or fractional unit root can be miscategorized in stationarity tests if the series has structural breaks. This finding is tested on Finnish and Swedish party popularity series. The composition and nature of popularity series provide reasons to assume fractional dynamics. The years included, 1987-2001, offer several reasons for the existence of structural breaks. Three series have breaks and in two cases control of the structural breaks changes the unit root assumption to a fractional unit root. Popularity series have either long or perfect memory, but this property cannot be removed by controlling structural breaks.
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