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*http://mathsball.blogspot.com.es/2013/11/the-amazing-case-of-extra-car.html
*:''Triggered by <code>\bmathsball\.blogspot\.com\.es</code> on the global blacklist''|bot=Cyberbot II}}
{{refimprove|date=November 2011}}
{{Electoral systems}}
 
The '''largest remainder method''' (also known as '''[[Thomas Hare (political scientist)|Hare]]-Niemeyer method''' or as Vinton's method<ref>{{cite book|last=Tannenbaum|first=Peter|title=Excursions in Modern Mathematics|year=2010|publisher=Prentice Hall|location=New York|isbn=978-0-321-56803-8|pages=128|url=http://www.mypearsonstore.com/bookstore/product.asp?isbn=9780321568038}}</ref>) is one way of [[Apportionment (politics)|allocating seats proportionally]] for representative assemblies with [[Party-list proportional representation|party list]] [[voting systems]].  It contrasts with the [[highest averages method]].
 
==Method==
 
The ''largest remainder method'' requires the numbers of votes for each party to be divided by a quota representing the number of votes ''required'' for a seat (i.e. usually the total number of votes cast divided by the number of seats, or some similar formula). The result for each party will usually consist of an [[integer]] part plus a [[fraction (mathematics)|fractional]] [[remainder]]. Each party is first allocated a number of seats equal to their integer. This will generally leave some seats unallocated: the parties are then ranked on the basis of the fractional remainders, and the parties with the largest remainders are each allocated one additional seat until all the seats have been allocated. This gives the method its name.
 
==Quotas==
 
There are several possibilities for the quota. The most common are:
the [[Hare quota]] and the [[Droop quota]].
 
The Hare (or simple) Quota is defined as follows
 
:<math>\frac{\mbox{total} \; \mbox{votes}}{\mbox{total} \; \mbox{seats}}</math>
 
The '''Hamilton method of apportionment''' is actually a largest-remainder method which uses the Hare Quota. It is named after [[Alexander Hamilton]], who invented the largest-remainder method in 1792. It is used for legislative elections in [[Russia]] (with a 7% exclusion threshold since 2007), [[Ukraine]] (3% threshold), [[Namibia]] and [[Hong Kong]]. It was historically applied for [[United States Congressional Apportionment|congressional apportionment]] in the [[United States]] during the 19th century.
 
The [[Droop quota]] is the integer part of
:<math>1+\frac{\mbox{total} \; \mbox{votes}}{1+\mbox{total} \; \mbox{seats}}</math>
and is applied in elections in South Africa. The [[Hagenbach-Bischoff quota]] is virtually identical, being
:<math>\frac{\mbox{total} \; \mbox{votes}}{1+\mbox{total} \; \mbox{seats}}</math>
either used as a fraction or rounded up.
 
The Hare quota tends to be slightly more generous to less popular parties and the Droop quota to more popular parties, and can arguably be considered more proportional than Droop quota<ref>See the following references: [http://www.parl.gc.ca/Content/LOP/researchpublications/bp334-e.pdf] [http://polmeth.wustl.edu/polanalysis/vol/8/PA84-381-388.pdf] [http://www.dur.ac.uk/john.ashworth/EPCS/Papers/Suojanen.pdf] [http://users.ox.ac.uk/~sann2300/041102-ceg-electoral-consequences-lijphart.shtml] [http://janda.org/c24/Readings/Lijphart/Lijphart.html].</ref> although it is more likely to give fewer than half the seats to a list with more than half the vote.
 
The [[Imperiali quota]]
:<math>\frac{\mbox{total} \; \mbox{votes}}{2+\mbox{total} \; \mbox{seats}}</math>
is rarely used since it suffers from the defect that it might result in more seats being allocated than there are available (this can also occur with the [[Hagenbach-Bischoff quota]] but it is very unlikely, and it is impossible with the Hare and Droop quotas). This will certainly happen if there are only two parties. In such a case, it is usual to increase the quota until the number of candidates elected is equal to the number of seats available, in effect changing the voting system to the Jefferson apportionment formula (see [[D'Hondt method]]).
 
== Examples==
 
These examples take an election to allocate 10 seats where there are 100,000 votes.
 
===Hare quota===
<table border=1>
<tr>
  <td >Party</td>
  <td  >Yellows</td>
  <td  >Whites</td>
  <td  >Reds</td>
  <td  >Greens</td>
  <td  >Blues</td>
  <td  >Pinks</td>
  <td  >Total</td>
</tr>
<tr  >
  <td  >Votes</td>
  <td >47,000</td>
  <td  >16,000</td>
  <td  >15,800</td>
  <td  >12,000</td>
  <td  >6,100</td>
  <td  >3,100</td>
  <td >100,000</td>
</tr>
<tr  >
  <td  >Seats</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >10</td>
</tr>
<tr  >
  <td >Hare Quota</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >10,000</td>
</tr>
<tr  >
  <td  >Votes/Quota</td>
  <td >4.70</td>
  <td  >1.60</td>
  <td  >1.58</td>
  <td  >1.20</td>
  <td  >0.61</td>
  <td  >0.31</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Automatic seats</td>
  <td >4</td>
  <td  >1</td>
  <td  >1</td>
  <td  >1</td>
  <td  >0</td>
  <td  >0</td>
  <td  >7</td>
</tr>
<tr  >
  <td  >Remainder</td>
  <td  >0.70</td>
  <td  >0.60</td>
  <td  >0.58</td>
  <td  >0.20</td>
  <td  >0.61</td>
  <td  >0.31</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Highest Remainder Seats </td>
  <td  >1</td>
  <td  >1</td>
  <td  >0</td>
  <td  >0</td>
  <td  >1</td>
  <td  >0</td>
  <td  >3</td>
</tr>
<tr  >
  <td  >Total Seats </td>
  <td  >5</td>
  <td  >2</td>
  <td  >1</td>
  <td  >1</td>
  <td  >1</td>
  <td  >0</td>
  <td  >10</td>
</tr>
</table>
 
===Droop quota===
<table border=1>
<tr  >
  <td >Party</td>
  <td  >Yellows</td>
  <td  >Whites</td>
  <td  >Reds</td>
  <td  >Greens</td>
  <td  >Blues</td>
  <td  >Pinks</td>
  <td  >Total</td>
</tr>
<tr  >
  <td  >Votes</td>
  <td  >47,000</td>
  <td  >16,000</td>
  <td  >15,800</td>
  <td  >12,000</td>
  <td  >6,100</td>
  <td  >3,100</td>
  <td  >100,000</td>
</tr>
<tr  >
  <td  >Seats</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >10</td>
</tr>
<tr  >
  <td >Droop Quota</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td  >9,091</td>
</tr>
<tr  >
  <td  >Votes/Quota </td>
  <td >5.170</td>
  <td >1.760</td>
  <td >1.738</td>
  <td >1.320</td>
  <td >0.671</td>
  <td >0.341</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Automatic  seats </td>
  <td  >5</td>
  <td  >1</td>
  <td  >1</td>
  <td  >1</td>
  <td  >0</td>
  <td  >0</td>
  <td  >8</td>
</tr>
<tr  >
  <td  >Remainder</td>
  <td >0.170</td>
  <td >0.760</td>
  <td >0.738</td>
  <td >0.320</td>
  <td >0.671</td>
  <td >0.341</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Highest Remainder Seats </td>
  <td  >0</td>
  <td  >1</td>
  <td  >1</td>
  <td  >0</td>
  <td  >0</td>
  <td  >0</td>
  <td  >2</td>
</tr>
<tr  >
  <td  >Total Seats </td>
  <td  >5</td>
  <td  >2</td>
  <td  >2</td>
  <td  >1</td>
  <td  >0</td>
  <td  >0</td>
  <td  >10</td>
</tr>
</table>
 
===Pros and cons===
:It is relatively easy for a voter to understand how the largest remainder method allocates seats. The Hare quota gives an advantage to smaller parties while the Droop quota favours larger parties.<ref>See for example the [[Hong Kong legislative election, 2012#Geographical_constituencies_.2835_seats.29|2012 election in Hong Kong Island]] where the DAB ran as two lists and gained twice as many seats as the single-list Civic despite receiving fewer votes in total: [http://www.nytimes.com/2012/09/11/world/asia/hong-kong-voting-for-legislature-is-heavy.html?pagewanted=all New York Times report]</ref> However, whether a list gets an extra seat or not may well depend on how the remaining votes are distributed among other parties: it is quite possible for a party to make a slight percentage gain yet lose a seat if the votes for other parties also change. A related feature is that increasing the number of seats may cause a party to lose a seat (the so-called [[Alabama paradox]]). The [[highest averages method]]s avoid this latter paradox but since no apportionment method is entirely free from paradox<ref>
{{cite book |title=Fair Representation: Meeting the Ideal of One Man, One Vote  |last=Balinski |first=Michel  |author2=H. Peyton Young |year=1982 |publisher=Yale Univ Pr  |isbn=0-300-02724-9 }}</ref>, they introduce others like quota violation<ref>{{cite web|url=http://rangevoting.org/Apportion.html|title=RangeVoting: Apportionment and rounding schemes|author=Messner et al.|accessdate=2014-02-02}}</ref>.
 
==Technical evaluation and paradoxes==
The largest remainder method is the only apportionment that satisfies the [[quota rule]]; in fact, it is designed to satisfy this criterion. However, it comes at the cost of [[Apportionment paradox|paradoxical behaviour]]. The [[Alabama paradox]] is exhibited when an increase in seats apportioned leads to a decrease in the number of seats allocated to a certain party. Suppose 25 seats are to be apportioned between 6 parties with votes cast in the proportions 1500:1500:900:500:500:200. The two parties with 500 votes get three seats each. Now allocate 26 seats, and it will be found that the these parties get only two seats apiece.
 
With 25 seats, we get:
 
<table border=1>
<tr>
  <td >Party</td>
  <td  >A</td>
  <td  >B</td>
  <td  >C</td>
  <td  >D</td>
  <td  >E</td>
  <td  >F</td>
  <td  >Total</td>
</tr>
<tr  >
  <td  >Votes</td>
  <td >1500</td>
  <td  >1500</td>
  <td  >900</td>
  <td  >500</td>
  <td  >500</td>
  <td  >200</td>
  <td >5100</td>
</tr>
<tr  >
  <td  >Seats</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >25</td>
</tr>
<tr  >
  <td >Hare Quota</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >204</td>
</tr>
<tr  >
  <td  >Quotas Received</td>
  <td >7.35</td>
  <td  >7.35</td>
  <td  >4.41</td>
  <td  >2.45</td>
  <td  >2.45</td>
  <td  >0.98</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Automatic seats</td>
  <td >7</td>
  <td  >7</td>
  <td  >4</td>
  <td  >2</td>
  <td  >2</td>
  <td  >0</td>
  <td  >22</td>
</tr>
<tr  >
  <td  >Remainder</td>
  <td  >0.35</td>
  <td  >0.35</td>
  <td  >0.41</td>
  <td  >0.45</td>
  <td  >0.45</td>
  <td  >0.98</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Surplus seats</td>
  <td  >0</td>
  <td  >0</td>
  <td  >0</td>
  <td  >1</td>
  <td  >1</td>
  <td  >1</td>
  <td  >3</td>
</tr>
<tr  >
  <td  >Total Seats </td>
  <td  >7</td>
  <td  >7</td>
  <td  >4</td>
  <td  >3</td>
  <td  >3</td>
  <td  >1</td>
  <td  >25</td>
</tr>
</table>
 
With 26 seats, we have:
<table border=1>
<tr>
  <td >Party</td>
  <td  >A</td>
  <td  >B</td>
  <td  >C</td>
  <td  >D</td>
  <td  >E</td>
  <td  >F</td>
  <td  >Total</td>
</tr>
<tr  >
  <td  >Votes</td>
  <td >1500</td>
  <td  >1500</td>
  <td  >900</td>
  <td  >500</td>
  <td  >500</td>
  <td  >200</td>
  <td >5100</td>
</tr>
<tr  >
  <td  >Seats</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >26</td>
</tr>
<tr  >
  <td >Hare Quota</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >&nbsp;</td>
  <td >196</td>
</tr>
<tr  >
  <td  >Quotas Received</td>
  <td >7.65</td>
  <td  >7.65</td>
  <td  >4.59</td>
  <td  >2.55</td>
  <td  >2.55</td>
  <td  >1.02</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Automatic seats</td>
  <td >7</td>
  <td  >7</td>
  <td  >4</td>
  <td  >2</td>
  <td  >2</td>
  <td  >1</td>
  <td  >23</td>
</tr>
<tr  >
  <td  >Remainder</td>
  <td  >0.65</td>
  <td  >0.65</td>
  <td  >0.59</td>
  <td  >0.55</td>
  <td  >0.55</td>
  <td  >0.02</td>
  <td >&nbsp;</td>
</tr>
<tr  >
  <td  >Surplus seats</td>
  <td  >1</td>
  <td  >1</td>
  <td  >1</td>
  <td  >0</td>
  <td  >0</td>
  <td  >0</td>
  <td  >3</td>
</tr>
<tr  >
  <td  >Total Seats </td>
  <td  >8</td>
  <td  >8</td>
  <td  >5</td>
  <td  >2</td>
  <td  >2</td>
  <td  >1</td>
  <td  >26</td>
</tr>
</table>
 
==See also==
* [[List of democracy and elections-related topics]]
 
==References==
{{reflist}}
 
==External links==
* [http://www.cut-the-knot.org/Curriculum/SocialScience/AHamilton.shtml Hamilton method experimentation applet] at [[cut-the-knot]]
* [http://mathsball.blogspot.com.es/2013/11/the-amazing-case-of-extra-car.html A practical example of the Hamilton's method]
[[Category:Party-list PR]]

Latest revision as of 18:24, 11 December 2014

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