First Preference Quotas. Maximum Preference Quotas. Whole first preference quotas. Average fractional quota per constituency. Total MLA's elected.
Efficiency is the ratio of the share of quotas to the share of seats won.
A value of 1.00 would mean that the number of seats won is commensurate with the share of the popular vote normalized for differential turnout and electorate size. Note that this measure shows not so much that SDLP did poorly in translating votes into seats, but rather that UUP did particularly well. Inter-factional coalition needed. Where a party had a fractional quota of more than .70 they secured an additional seat in all 16 cases. A larger fractional quota means fewer transfers are needed to secure an additional seat.