How does your team measure up ?

Last updated: 02/01/2012

There were very few bouts over the first part of the winter. The East coast bubble that saw the Maritimes place much higher than anticipated is still not popped, which makes the rankings a bit unlikely. The fact is that we are now dealing with the bare minimum amount of connecting data to be able to calculate rankings in a single division. We may have to divide it into an East and West ranking unless this summer sees some pan-Canadian bouts.

		travel teams		rating
1		New Skids on the Block	Montreal, QC	245.528
2		TCRG All-Stars	Vancouver, BC	176.766
3		Belladonnas	Red Deer, AB	85.404
4		OCDG All-Stars	Edmonton, AB	77.227
5	+1	Forest City Derby Girls	London, ON	66.813
6	-1	E-Ville Dead	Edmonton, AB	63.246
7		Lumbersmacks	Moncton, NB	63.118
8		CN Power	Toronto, ON	46.369
9	+1	Thunder	Kitchener, ON	40.476
10	-1	Eves of Destruction	Victoria, BC	39.379
11		Kootenay Kannibelles	West Kootenays, BC	26.736
12		Dolly Rogers	Ottawa, ON	25.807
13		Pile O' Bones All-Stars (aka Molly Tovs, aka Sugar Skulls)	Regina, SK	21.065
14		Reign Valley Vixens Vets	Abbotsford, BC	-1.073
15		Hellion Rebellion	Calgary, AB	-24.656
16		The Mindfox (aka Saskatoon Roller Derby)	Saskatoon, SK	-27.849
17		Raggedy Rollers	Okanagan, BC	-29.307
18		Royal City Rollergirls All-Stars (A Team)	Guelph, ON	-31.102
19		Jam Jams	Saint-John's, NF	-38.774
20		Durham Derby Devils	Durham, ON	-40.47
21		Rated PG Rollergirls	Prince George, BC	-51.487
22		Nightshades (B Team)	Red Deer, AB	-62.813
23		Harlots (B Team)	Hamilton, ON	-66.906
24		Vixens	Ottawa, ON	-69.337
25		Murder City Maidens	Winnipeg, MB	-72.774
26		Misfits of Mayhem	Lacombe, AB	-74.292
27		Daisy Cutters	Fredericton, NB	-79.771
28		Heavenly Rollers	Saint Albert, AB	-81.305
29		Deathbridge Derby Dames	Lethbridge, AB	-90.232
30		Halifax Heartless	Halifax, NS	-91.6
31		EH Team	Hamilton, ON	-92.323
32		South Simcoe Rebel Rollers	Simcoe, ON	-93.737
33		Tank'er Girls (B Team)	Edmonton, AB	-100.511
34		Gas City Rollers	Medicine Hat, AB	-105.151
35		Peach Tarts	Okanagan, BC	-108.075
36		Belles of the Brawl	Brantford, ON	-162.912
37		Ottawa Roller Derby	Ottawa, ON	-318.524

 

		house teams		rating
1		Slaughter Daughters	Ottawa, ON	130.264
2		Contrabanditas	Montreal, QC	114.808
3		Reines of Terror	Moncton, NB	94.217
4		La Racaille	Montreal, QC	77.002
5		Chicks Ahoy!	Toronto, ON	70.803
6		Gore-Gore Rollergirls	Toronto, ON	67.581
7		Vicious Dishes	Kitchener, ON	61.047
8		Filles du Roi	Montreal, QC	55.084
9		Faster Pussycats	Vancouver, BC	35.375
10		Death Row Dames	Hamilton, ON	31.912
11		Death Track Dolls	Toronto, ON	30.368
12		Public Frenemy	Vancouver, BC	27.766
13		Venus Fly Tramps	Kitchener, ON	24.846
14		Bad Reputations	Vancouver, BC	20.988
15		Daughters of Anarchy	Moncton, NB	18.062
16		Violet Uprising	Guelph, ON	11.947
17	+5	Berzerkhers	Edmonton, AB	5.088
18	-1	Black Gold Diggers	Edmonton, AB	4.274
19	-1	Thames Fatales	London, ON	2.732
20		Scarlet Swarm	Saint-John, NB	-1.875
21		Razor Girls	Saint-John, NB	-2.12
22	+1	Thrashin' Lassies	Calgary, AB	-9.606
23	+1	Lucious Lunch Ladies	London, ON	-11.151
24	-5	Slice Girls	Edmonton, AB	-13.397
25		Our Ladies of Pain	Guelph, ON	-16.836
26		Los Pistolitas	Edmonton, AB	-33.167
27		Disloyalists	Kingston, ON	-37.804
28	+1	Riot Squad	Ottawa, ON	-39.825
29	-1	Cut Throat Car Hops	Calgary, AB	-40.157
30	+1	Kiss Me Deadlies	Abbotsford, BC	-40.778
31	-1	Derby Debutantes	Toronto, ON	-41.053
32		Killer Queens	Guelph, ON	-44.487
33		B52 Bellas	Calgary, AB	-53.343
34		Riot Girls	Vancouver, BC	-63.054
35		Total Knock-Outs	Kitchener, ON	-67.64
36		Smoke City Betties	Toronto, ON	-76.239
37		Doomsday Bunnies	Abbotsford, BC	-82.509
38		Anarchy Angels	Abbotsford, BC	-84.164
39		Rollergettes	Toronto, ON	-84.885
40		Chrome Mollys	Toronto, ON	-138.577

 

 

 

 

 

Concerns, criticism, questions and comments are welcome here:

submit scores

We accept intra-league house team and inter-league scores just as much as travel team and tournaments scores, we're ranking everyone! (see below for the criteria a bout needs to meet to be accepted for the ranking)

about the rollergirl.ca canadian roller derby ranking

Last updated: 06/01/2010

The ranking system is designed to rank house teams and travel teams along a single scale so travel team, inter-league and intra-league bout scores all matter.

Which games count?

• It must involve two currently active Canadian teams playing under their real name. No makeshift teams.
• Both teams must have at least 9 players on their roster including no more than 2 borrowed players per team. "Borrowed players" for house teams are players that are not normally part of that team, for travel teams "borrowed players" are players borrowed from outside the travel team's league. This is designed to accommodate smaller leagues that don't yet have a regular travel team roster, we still encourage teams to aim towards having a regular roster and avoid borrowing players.
• It must be a full length bout (1hr) unless the bout is part of a larger tournament in which case bouts as short as 20min are accepted. Scores for bouts of less than an hour are multiplied to obtain the equivalent score for an hour long bout: 20min bout scores are multiplied by 3, 30min bouts by 2, thus proportionally increasing the point margin.
• It must be supervised by a minimum of 5 skating referees and enough NSO to keep proper scores.

Scores can be contested, make sure you send us accurate data.
We will be accepting scores submissions from anyone, the scores will be verified and posted on RollerGirl.ca for all to see. If you find that we have received incorrect information you are welcome to contest a score by email at .

The more the merrier.
The more data we have the more accurate the ranks will be now and in the future, make sure to send us as many valid bout scores as possible from 2009 on. With enough data the system should be able to rank all teams against all other teams, including teams that have never played together before, in a meaningful way, a truly national ranking.

So how does it work?
The RollerGirl.ca Canadian Roller Derby Ranking is based on a classic and simple sport ranking algorithm that uses the point margins of bouts to evaluate the rating of each team: The rating of a team is equal to their average point margin adjusted by the rating of their opponents. The point margins are first subject to blow-out protection then the bouts value is depreciated based on how old it is as explained hereunder. The teams are then sorted by rating and assigned a rank based on their position.

The difference between two teams rating represents the expected point margin should they meet on the track.

Blow-out protection
Our blow-out protection was removed in June 2011 to allow teams with extreme skill differences to meet on the track without penalty.

Depreciation
5/8 of the rating comes from the average point margin (plus the average opponent rating) from bouts that took place in the last 182 days (6 months). 1/4 comes from the same averages from bouts that took place in the 182 days before that and the remaining 1/8 from the 365 days before that. Beyond 730 days (2 years) the bouts no longer count at all.

How accurate is it?
Sports ranking systems are never truly accurate, in fact each different method is likely to yield a different result for the same data. Rating and ranking sport teams is very subjective even if you could take into account all environmental variables. Keep in mind that our ranking system uses the final scores and nothing else to rate a team, it does not account for missing players, injuries, slippery floors, bad reffing etc. The fact that roller derby, the rules, the leagues, teams and players are still evolving quite fast makes the sport that much harder to rank. The current method, as with any average based rating system, will become more accurate as it accumulates data. Even so, because many teams are a few degrees of separation away from each other (it's a big country eh!) and often only have a single distant opponent in common, the ratings and ranking are expected to change a lot as more bouts are added. The ratings and rankings are therefore to be considered "for recreational purposes only", though we assure you that they are generated using a just and unbiased method that should yield very reasonable results.

Is this how WFTDA does their ranking?
No it's not but it's similar. We elected to use the current simple system in the early days of the ranking because it deals better with very little data. In other words, it's better at yielding a fairly meaningful result for teams that haven't played much outside their immediate circle, which is the case for many Canadian leagues. As Canadian roller derby grows and teams start playing more teams, more often, we will eventually migrate to a more sophisticated algorithm like the one used by the WFTDA ranking. However because of the very nature and structure of Canadian roller derby, in contrast to the WFTDA structure, it's likely that an unmodified WFTDA ranking system would never really yield meaningful results for the Canadian derby scene.

Why isn't this team shown on the ranking? I sent you the scores!
Before the system can accurately rate a team it must have enough data to "reach out" to the rest of the data. That is to say that teams need to play at least 3 teams that have played other teams, otherwise we simply don't have a point of reference. Fear not, the scores you send in the meantime are still very useful and will help the team's ranking once there's enough data for it to be included.

Why is this team ranked under that team? they beat them!
They may have, but that doesn't mean that they are necessarily better. They may have gotten beaten badly by that team before, or they may have done far worse against a common opponent. In fact they are ranked under because on average they score worse than the team above.

submitted scores log

-> Jump to Invalid Bouts

All bouts sorted by team (PDF)

Last Updated: 02/01/2012