Computes the relative measure of party size as suggested by Giebler/Lacewell/Regel/Werner 2015.
mp_rmps(data)
a numerical vector with vote shares
a vector of rmps values
Giebler, Heiko, Onawa Promise Lacewell, Sven Regel and Annika Werner. 2015. Niedergang oder Wandel? Parteitypen und die Krise der repraesentativen Demokratie. In Steckt die Demokratie in der Krise?, ed. Wolfgang Merkel, 181-219. Wiesbaden: Springer VS.