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Reference.org
Huntington–Hill method
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<p>The Huntington–Hill method, sometimes called method of equal proportions, is a <a href="/facts/Highest_averages_method/DwF5mkS2">highest averages method</a> for assigning seats in a <a href="/facts/Legislature/ycUCe91S">legislature</a> to <a href="/facts/Political_parties/IAKw7oEK">political parties</a> or <a href="/facts/State_(administrative_division)/NzFQ4vdt">states</a>. Since 1941, this method has been used to apportion the 435 seats in the United States House of Representatives following the completion of each decennial <a href="/facts/United_States_Census_Bureau/heKtzoXX">census</a>. </p><p>The method minimizes the <a href="/facts/Relative_difference/RrXmYBmn">relative difference</a> in the number of constituents represented by each legislator. In other words, the method selects the allocation such that no transfer of a seat from one state to another can reduce the percent error in representation for both states. </p>