Polling Firm Tendencies (Update)

I've added Harris-Decima to the polling firm leaning rankings. Overall, Harris-Decima's method is less favourable to both the Conservatives and the Liberals, and is most favourable to the Greens and to the Bloc Quebecois.

These are the rankings - to be constantly added to and updated - of the various polling firms in terms of their tendencies to favour one party over another. This does not necessarily equate to a deliberate bias, but instead is more reflective of the polling methods used.

As you can see, the list is not complete yet.

The following lists show each pollster's average variation from other polling firms. The numbers are the amount of percentage points a particular pollster favours or disfavours that particular party compared to other pollsters.

NATIONAL - CONSERVATIVE PARTY

1. Ipsos-Reid +2.9
2. Angus-Reid Strategies +1.9
3. Léger Marketing -0.4
4. EKOS Research -1.1
5. Harris-Decima -2.6

NATIONAL - LIBERAL PARTY

1. EKOS Research +2.3
2. Léger Marketing +2.2
3. Ipsos-Reid +0.1
4. Harris-Decima -1.1
5. Angus-Reid Strategies -1.9

NATIONAL - NEW DEMOCRATIC PARTY

1. Angus-Reid Strategies +0.7
2. Harris-Decima -0.0
3. Léger Marketing -0.2
4. EKOS Research -1.5
5. Ipsos-Reid -2.3

NATIONAL - GREEN PARTY

1. Harris-Decima +2.1
2. EKOS Research +1.3
3. Ipsos-Reid -1.1
4. Angus-Reid Strategies -2.2
5. Léger Marketing -2.6

ONTARIO - CONSERVATIVE PARTY

1. Angus-Reid Strategies +3.2
2. Ipsos-Red +1.6
3. Harris-Decima -1.0
4. Léger Marketing -1.4
5. EKOS Research -1.7

ONTARIO - LIBERAL PARTY

1. Léger Marketing +5.0
2. EKOS Research +2.1
3. Ipsos-Reid +0.8
4. Angus-Reid Strategies -2.5
5. Harris-Decima -2.6

ONTARIO - NEW DEMOCRATIC PARTY

1. Harris-Decima +0.4
2. Angus-Reid Strategies -0.4
3. Léger Marketing -1.2
4. Ipsos-Reid / EKOS Research -2.3

ONTARIO - GREEN PARTY

1. Harris-Decima +2.2
2. EKOS Research +1.9
3. Ipsos-Reid -0.5
4. Léger Marketing -1.8
5. Angus-Reid Strategies -2.0

QUEBEC - CONSERVATIVE PARTY

1. Ipsos-Reid +1.6
2. EKOS Research +0.7
3. Angus-Reid Strategies -0.2
4. Harris-Decima -2.0
5. Léger Marketing -3.3

QUEBEC - LIBERAL PARTY

1. Léger Marketing +3.0
2. Harris-Decima +0.4
3. Ipsos-Reid +0.1
4. Angus-Reid Strategies -1.3
5. EKOS Research -4.7

QUEBEC - NEW DEMOCRATIC PARTY

1. EKOS Research +0.3
2. Ipsos-Reid -0.0
3. Léger Marketing -0.3
4. Angus-Reid Strategies -1.1
5. Harris-Decima -2.3

QUEBEC - BLOC QUÉBÉCOIS

1. Léger Marketing +3.8
2. Harris-Decima +3.0
3. Angus-Reid Strategies +2.7
4. Ipsos-Reid +2.3
5. EKOS Research +1.2

QUEBEC - GREEN PARTY

1. EKOS Research +3.4
2. Ipsos-Reid -0.7
3. Harris-Decima -1.1
4. Angus-Reid Strategies -1.5
5. Léger Marketing -2.8