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Biproportional apportionment is a method to allocate seats into a party-list proportional representation respecting two characteristics. That is, for two different partitions each part receives the proportional number of seats within the total number of seats. For instance, this method could give proportional results by party and by region, or by party and by gender/ethnicity, or by any other pair of characteristics. == Process == Suppose that the method is to be used to give proportional results by party and by region. Each party nominates a candidate list for every region. The voters vote for the party lists of their region. The results are calculated in two steps: :In the so called ''upper apportionment'' the seats for each party (over all regions) and the seats for each region (from all parties) are determined. :In the so called ''lower apportionment'' the seats are distributed to the regional party list respecting the results from the upper apportionment. This can be seen as globally adjusting the voting power of each party's voters by the minimum amount necessary so that the region-by-region results become proportional by party. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Biproportional apportionment」の詳細全文を読む スポンサード リンク
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