can time series have unit root can time series data reject unit root and show structural break time series can have both unit root and structural break when do time series data have _________ can a time series have both a unit and structural break can time series have both unit root and structural break can you have both unit root and breaking break in a time series can data have both unit root and structural break can time series data have both unit root and structural break can time series data have both unit root and structural break does time series data have unit root and structural break can time series have unit root and structural break do time series always reject unit root data? can time series data have both unit root and structural break? can time series data have both unit root and structural break? can time series have unit roots can time series have both unit roots and structural breaks how often do you need unit root data what data has unit root and structural break can time series data have unit root and structural break