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CPS formula
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Gravity
Terms in this set (12)
effective number of parties
N= 1/sum of (seats or votes won/total seats or votes)^2
percent reduction in number of parties
Nv-Ns/Nvx100
Least Sq/ Gallagher Index
LSq= Sq root of (sum of (%votes-%seats)/2)
measures an electoral systems relative disproportionality bw votes received and seats
volatility
1/2 x sum of |party's vote or seat share in last election- party's vote or seat share in this election|
how consistent elections are from one to the next
Power index
influence of given party determined by placement on partisan spectrum and how central it is for creating majority coalition
find majority (half of number of seats) and list coalitions that would reach this, then tally how many times each party comes up and express in fraction over the total number of parties in the combinations, convert to percentage
Plurality
winner takes all
Hare
Q=V/M where M is number of seats
-dont subtract quota if its negative
Imperiali
Q=V/(M+3)
don't subtract if its negative
D'Hondt
divide V by 2, 3, 4... seats given to parties w biggest numbers
Sainte Lauge
divide V by 1, 3, 5 (odd numbers).. setas given to partys with biggest numbers
Dropp Quota
v/ (M+1)+1
deviation from proportionality
D=1/2 x sum of |percent of votes received- percent of seats allocated|
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