The voter transition analysis allows the user to see how the votes transitioned from one party to another after the elections. The idea is a simple one: if a party gains most votes in those municipalities in which another party had the most votes at the election before, it is interpreted as a vote transition between those parties.
This method is very popular in countrys like Austria and Germany but doesn’t really work in 2-Party systems like the US.
Below you can see some examples of interactive voter transition analysis:
This tool from the austrian newspaper “Der Standard” allows the user to see the voter transitions from all the elections in the last 100 years. The information is displayed in a sankey diagram.
In this analysis from the austrian Newspaper “Kurier” they also use a sankey diagram rotated by 90 degrees. Overall this display has a very static feeling.
This is a different representation of the same data. For this vizualization a chord diagram is used.