DEMOCRACY The Amazing Proportional Representation Simulator

Scarborough-Don Valley


In this model, the eight existing ridings of
Don Valley East
Don Valley West
Scarborough Centre
Scarborough East
Scarborough Southwest
Scarborough-Agincourt
Scarborough-Rouge River
and Willowdale
have been combined into one riding, which we will call Scarborough-Don Valley.

The new riding would elect eight members of parliament.



Ontario provincial election - 2003


Scarborough-Don Valley - Actual results Ontario provincial Election 2003
  Liberal Progressive Conservative NDP Green Family Coalition Other Total
Don Valley East 21,327 12,027 3,058 558 460 119 37,549
Don Valley West 23,488 17,394 2,540 1,239 0 0 44,661
Scarborough Centre 21,698 11,686 3,653 642 495 3,500 41,674
Scarborough East 21,798 14,323 5,250 668 0 285 42,324
Scarborough Southwest 17,501 11,826 6,688 689 586 0 37,290
Scarborough-Agincourt 23,026 11,337 2,209 566 550 0 37,688
Scarborough-Rouge River 23,976 9,468 2,246 1,326 536 0 37,552
Willowdale 21,823 19,957 3,084 933 442 227 46,466
Total votes received 174,637 108,018 28,728 6,621 3,069 4,131 325,204
Seats won 8 0 0 0 0 0 8
Seat% 100% 0% 0% 0% 0% 0% 100%
Vote % 53.70% 33.22% 8.83% 2.04% 0.94% 1.27% 100%
Index of Distortion +46.30 -33.22 -8.83 -2.04 -0.94 -1.27 46.30

In the 2003 Ontario provincial election, all eight ridings elected Liberal MPPs.

Under the existing voting system, 53.70% of the voters got the representative they voted for.

The other 46.30% of the votes were wasted.


In our model, the seats would have been allocated as follows:

Scarborough-Don Valley - Simulated Proportional Distribution -Ontario provincial election 2003
  Liberal Progressive Conservative NDP Green Family Coalition Other Total
Total votes received 174,637 108,018 28,728 6,621 3,069 4,131 325,204
Seats won 4 3 1 0 0 0 8
Seat % 50.00% 37.50% 12.50% 0% 0% 0% 100%
Vote % 53.70% 33.22% 8.83% 2.04% 0.94% 1.27% 100%
Index of Distortion -3.70 +4.28 +3.67 -2.04 -0.94 -1.27 7.95

Under this model, 95.75% of the voters would have helped to elect a local representative.

Another 2.98% of the voters would know that their vote had helped to elect provincial list members, so they would also have representation.

Only 1.27% of the votes cast would not have helped to elect an MPP, and therefore would be wasted.


Simulated compensatory list seats - Ontario provincial election 2003
Liberal Progressive Conservative NDP Green Family Total
6 8 2 4 1 21



Canadian federal election - 2000


Scarborough-Don Valley - Actual results Canadian federal election 2000
  Liberal Canadian Alliance Progressive Conservative NDP Green Other Total
Don Valley East 25,915 4,736 5,645 2,249 0 365 38,910
Don Valley West 25,329 7,239 10,583 2,024 0 566 45,741
Scarborough Centre 26,969 8,849 0 3,171 0 959 39,948
Scarborough East 24,019 7,559 6,284 1,884 0 405 40,151
Scarborough Southwest 21,466 4,912 5,251 3,638 0 501 35,768
Scarborough-Agincourt 26,986 5,100 4,030 1,499 0 453 38,068
Scarborough-Rouge River 28,669 3,237 2,566 1,793 0 0 36,265
Willowdale 27,038 7,411 7,134 2,404 0 145 44,132
Total votes received 206,391 49,043 41,493 18,662 0 3,394 318,983
Seats won 8 0 0 0 0 0 8
Seat % 100% 0% 0% 0% 0% 0% 100%
Vote % 64.70% 15.37% 13.01% 5.85 0% 1.06% 100%
Index of Distortion +35.30 -15.37 -13.01 -5.85 0 -1.06 35.30

In the 2000 Canadian federal election, all eight ridings elected Liberal MPs.

Under the existing voting system, 64.70% of the voters got the representative they voted for.

The other 35.30% of the votes were wasted.


In our model, the seats would have been allocated as follows:

Scarborough-Don Valley - Simulated Proportional Distribution - Canadian federal election 2000
  Liberal Canadian Alliance Progressive Conservative NDP Green Other Total
Total votes received 206,391 49,043 41,493 18,662 0 3,394 318,983
Seats won 5 1 1 1 0 0 8
Seat % 62.50% 12.50% 12.50% 12.50% 0% 0% 100%
Vote % 64.70% 15.37% 13.01% 5.85 0% 1.06% 100%
Index of Distortion -2.20 -2.87 -0.51 +6.65 0 -1.06 6.65

Under this model, 98.93% of the voters would have helped to elect a local representative.

Only 1.06% of the votes cast would not have helped to elect an MP, and therefore would be wasted.


Ontario - Simulated compensatory list seats - Canadian federal election 2000
Liberal Canadian Alliance Progressive Conservative NDP Green Total
0 9 6 5 1 21


DEMOCRACY The Amazing Proportional Representation Simulator