Once the presence of a unit root is known in the time series data set, one knows which is the correct statistical approach. (realclimate.org)
I've finally posted the CO2 time series data on my web site. (realclimate.org)
This is reinforced by time series data from the British Election Survey showing the proportion of strong party identifiers, and the contrast over time is striking - «very strong» party identification plummeted from around 50 % in the mid-1960s to the mid-teens by 2001. (totalpolitics.com)