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The Gallagher index is a statistical analysis methodology utilised within political science (notably the branch of psephology) which "measures an electoral system's relative disproportionality between votes received and seats allotted in a legislature." As such, it measures the difference between the percentage of votes each party gets and the percentage of seats each party gets in the resulting legislature, and it also measures this disproportionality from all parties collectively in any one given election. That collective disproportionality from the election is given a precise score, which can then be used in comparing various levels of proportionality among various elections from various electoral systems.

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  • Gallagher-Index (de)
  • Índice de Gallagher (es)
  • Gallagher index (en)
  • Indice de Gallagher (fr)
  • Индекс Галлахера (ru)
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  • El índice de Gallagher, creado por Michael Gallagher, "mide la desproporción relativa entre los votos recibidos y los asientos obtenidos en una legislatura dentro de un sistema electoral".​​ Como tal, mide la diferencia entre el porcentaje de votos que obtiene cada partido político y el porcentaje de posiciones obtenidas en el congreso". El índice se mide con la ecuación siguiente, en la cual se obtiene la raíz cuadrada de la mitad de la suma de los cuadrados de la diferencia del porcentaje de voto y el porcentaje de posiciones de cada partido político.​ ​ (es)
  • Der Gallagher-Index ist eine Methode, um die Wahlgleichheit eines Wahlergebnisses zu ermitteln, welches sich in der Differenz des Stimmenanteils einer Partei bei der Wahl und des Prozentsatz an Sitzen der Partei in der darauf folgenden Legislaturperiode ergibt. Dazu nimmt man die Quadratwurzel der Hälfte der Summe des Quadrats von der Differenz zwischen Stimmanteil und Mandatsanteil für jede der politischen Parteien: Lsq steht dabei für least square, also kleinstes Quadrat. n gibt die Anzahl der Parteien an, V steht für Stimmen in % (votes) und S für Sitze im Parlament in %. (de)
  • The Gallagher index is a statistical analysis methodology utilised within political science (notably the branch of psephology) which "measures an electoral system's relative disproportionality between votes received and seats allotted in a legislature." As such, it measures the difference between the percentage of votes each party gets and the percentage of seats each party gets in the resulting legislature, and it also measures this disproportionality from all parties collectively in any one given election. That collective disproportionality from the election is given a precise score, which can then be used in comparing various levels of proportionality among various elections from various electoral systems. (en)
  • En statistique, l'indice de Gallagher est utilisé pour mesurer la disproportionnalité des résultats d'une élection. Il est fondé sur la différence entre les pourcentages de votes reçus et les pourcentages de sièges concédés à un parti à la suite d'une élection. Cela est particulièrement utile pour comparer la proportionnalité entre plusieurs systèmes électoraux. Plus exactement, l'indice prend la racine carrée de la demi-somme des carrés de la différence entre le pourcentage de votes et le pourcentage de sièges de chaque parti représenté dans une élection. En équation: (fr)
  • Индекс Галлахера (англ. Gallagher index), или индекс наименьших квадратов (англ. Least squares index, LSq) — показатель, измеряющий непропорциональность или несоответствие между долями голосов, поданных за политические партии на выборах, и долями мест, полученных ими в представительных органах. Используется в сравнительных политологических исследованиях избирательных систем, стабильности правительств и их электорату. Индекс был разработан Майклом Галлахером (Тринити-колледж, Дублин) в 1989 году и представлен в. (ru)
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