Here are the actual STV elections conducted at the provincial level in Alberta in 1948.
I compare expected seat counts based on first-count preferences with actual results by dividing vote tallies by quotas. And find that the actual seat counts are very proportional to expectations.
But do remember that the first-count vote totals are not used to allocate seats. They are only used as test or measure of part proportionality. The actual results of STV elections are produced through the magic of single votes in multi-member districts and vote transfers where necessary.
Election of Edmonton MLAs through STV in 1948,
where all Edmontonians voted in one district
Total votes: 46,150 Number of seats: 5
Quota: 7692 (minimum required to win a seat)
Actual seat count
First choice votes Probable seat count through STV
Party by party based on first choices after vote transfers
Social Credit 25,145 3 3
Cons. (under other name) 2723 0 0
Liberal 9239 1 1
CCF 9043 1 1
Election of Calgary MLAs through STV in 1948,
where all Calgarians voted in one district
Total votes: 39,101 Number of seats: 5 Quota: 6910
Actual seat count
First choice votes Probable seat count through STV
Party by party based on first choices after vote transfers
Social Credit 16,382 2 or 3 2
Cons. (under other name) 5651 0 or 1 1
Liberal 7456 1 1
CCF/Labour 7796 1 1
Thanks for reading.
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