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Adams's method is the unique merge-proof divisor method; Webster's method is neither split-proof nor merge-proof, but it is "coalition neutral": when votes are distributed randomly (with uniform remainders), a coalition is equally likely to gain a seat or to lose a seat. [7]: Prop.9.4
The Jefferson/D'Hondt method favors larger parties while the Webster/Sainte-Laguë method doesn't. [9] The Webster/Sainte-Laguë method is generally seen as more proportional, but risks an outcome where a party with more than half the votes can win fewer than half the seats. [31] When there are two parties, the Webster method is the unique ...
Apportionment is the process by which seats in a legislative body are distributed among administrative divisions, such as states or parties, entitled to representation.This page presents the general principles and issues related to apportionment.
The Sainte-Laguë or Webster method, first described in 1832 by American statesman and senator Daniel Webster and later independently in 1910 by the French mathematician André Sainte-Lague, uses the fencepost sequence post(k) = k+.5 (i.e. 0.5, 1.5, 2.5); this corresponds to the standard rounding rule. Equivalently, the odd integers (1, 3, 5 ...
Allocation of seats by state, as percentage of overall number of representatives in the House, 1789–2020 census. United States congressional apportionment is the process [1] by which seats in the United States House of Representatives are distributed among the 50 states according to the most recent decennial census mandated by the United States Constitution.
Below it can be seen how different apportionment methods yield different results when apportioning 100 seats. Here, parties B and A are Webster's method yields the same result (though this is not always the case). Otherwise, all other methods give a different number of seats to the parties.
if, in addition, it is also strongly exact, [jargon] then it is a divisor method. Young proved that the unique apportionment method that is a coherent extension of the natural two-party apportionment rule of rounding to the nearest integer is the Webster method. [9]: 49–50, 190 [10]: Sub.9.10
Since Jefferson was the first method used for Congressional apportionment in the United States, this violation led to a substantial problem where larger states often received more representatives than smaller states, which was not corrected until Webster's method was implemented in 1842. Although Webster's method can in theory violate the quota ...