Fig. 5

Positions of political parties. The starting points from Zucco and Power (Power and Zucco Jr 2009) (Additional file 1: Table S1) are from the election year of 1998. The points shown for year 2000 are already computed from our model. The points of interest are the location of the party in any election year. The error of each score is shown with the same color in higher transparency. Movements to the left or to the right along the ideological spectrum represents the dynamics of the churn rate of members in any election year. The stability of a party to its current ideology depends on the number of loyal and newly acquired members