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February 25, 2009
Numbers On Ice
Bayesian Power Rankings

by Tom Awad

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Hi everybody, and welcome to the inaugural edition of Numbers on Ice. In this column, I will make it my mission to enlighten you (and myself) as to the true strength and contribution of hockey teams and players. There is only one rule in this column: everything must be based on objective criteria. I will never simply give my opinion, and whenever I state something I will back it up with numerical data. Also, whenever I will be referring to players' and teams' performances for the current season, I will only be using the current season's data to perform my analysis. The Red Wings are the defending champs? Good for them. Martin Brodeur has won 3 Stanley Cups? Fantastic. When we'll do a career retrospective, that will certainly come into play, but when it comes to assigning this year's most valuable players or best teams, that has as little bearing as the opinion of the “experts”. A single fact can spoil a good argument, and often does.

This week, we will be running the inaugural version of the Bayesian Power Rankings. These rankings give each team's offensive and defensive strength, and allow us to extrapolate what the year's final standings are most likely to look like. We can even estimate a team's odds of making the playoffs and even of winning the Stanley Cup, assuming of course that they continue playing the way they have so far. A single trade or injury could turn these assumptions upside down, but unless we have a crystal ball this is the best we'll be able to do.

Here are the power rankings, up to and including games on Tuesday February 23rd:

Legend:

Orat: Offensive rating. The typical number of goals you would score against an average team. Higher is better.

Drat: Defensive rating. The typical number of goals an average team would score on you. Lower is better.

Trat: Total rating. O rat – D rat. Your typical margin of victory against an average team. Higher is better.

Schd: Schedule difficulty (the average T rat of your opponents). Higher means harder.

SPT: Predicted number of points at the end of the season. The standard deviation is about 14 at this point in the schedule.

PO%: Odds of making the playoffs, in percentage.

C%: Odds of winning the Stanley Cup, in percentage.


   Team         Orat Drat Trat Schd SPt PO% C%  Comment

 1 Red Wings    3.73 2.95 0.78 0.02 115 100 16  Strongest team except in goaltending.
                                                If Osgood finds his form or they land a
                                                better goaltender, they'll be favorites
                                                to repeat. Zetterberg/Datsyuk/Lidstrom
                                                may be best three position players on 
                                                any team. Scary good power play.

 2 Bruins       3.16 2.41 0.75 -.06 119 100 24  One of league's most balanced teams;
                                                Tim Thomas has been incredible. A lock
                                                for top seed in East with highest odds
                                                of winning the Cup.

 3 Sharks       3.25 2.59 0.66 0.01 122 100 16  Will likely finish first overall
                                                in the standings. 

 4 Blackhawks   3.21 2.57 0.64 0.10 106 100 12  Enjoying an incredible resurgence this
                                                year despite facing NHL's toughest
                                                schedule to date

 5 Capitals     3.21 2.90 0.32 -.08 107 100  6  One of league's most exciting teams to 
                                                watch, three of best position players
                                                in Ovechkin/Semin/Green. Only average
                                                defense and goaltending puts them at
                                                disadvantage against powerhouse teams.

 6 Flames       3.16 2.86 0.30 0.00 103  98  4  Incredible production from Rene Bourque
                                                and Michael Cammalleri.

 7 Devils       2.93 2.66 0.27 -.09 105 100  6  Expected to be even better when Brodeur
                                                returns, but he'll be hard pressed to
                                                play better than Clemensen has. 

 8 Flyers       3.16 2.91 0.26 -.08 101  97  5  Only Washington and Detroit can match
                                                top forwards Richards/Gagne/Carter.
                                                Special teams have been excellent.
                                                Among league's most penalized teams. 

 9 Wild         2.67 2.48 0.18 0.00  90  62  2  May be strongest team to fall out of
                                                playoff picture. Some of league's best
                                                goaltending (Niklas Backstrom) and good
                                                overall team defense; anemic offense
                                                may cost them a place in post-season.

10 Canucks      3.01 2.90 0.11 0.05  93  75  1  Average across board, should be enough
                                                to sneak into playoffs. Without Sedins
                                                and Luongo, would be a very bad team.

11 Stars        2.94 2.84 0.11 0.05  90  64  1  After early breakdown, hanging on to
                                                playoff spot by fingernails despite
                                                being different team since Avery left.

12 Sabres       2.92 2.83 0.09 -.05  92  75  2  If they make playoffs it'll be thanks
                                                to play of Ryan Miller before injury. 

13 Panthers     2.80 2.79 0.02 -.08  93  81  2  Out of playoffs for eight years, this
                                                season it appears they'll make it back
                                                on shoulders of Tomas Vokoun. Why is
                                                Vokoun never mentioned as one of elite
                                                goalies in league?

14 Ducks        2.86 2.88 -.02 0.06  86  36  0  Seems Bob Murray knows what he's doing
                                                when he says he'll be a seller at trade
                                                deadline; Anaheim will likely miss
                                                playoffs—if they make it, they'd meet
                                                San Jose or Detroit. Still too many
                                                penalties for their own good.

15 Blue Jackets 2.77 2.80 -.03 0.05  88  46  1  Finally respectable after years with
                                                league's most anemic offense. In
                                                Western Conference, they may still not
                                                be good enough to make the postseason.
                                                Badly need to improve power-play.

16 Blues        2.80 2.84 -.04 0.06  82  18  0  Not a bad team; not a very good one.
                                                Won't qualify for the playoffs, but
                                                they have a gem in Patrik Berglund.

17 Canadiens    2.99 3.09 -.10 0.00  94  85  1  Sexy pick as team of the year (their
                                                centennial) and after strong play last
                                                season, but they recently fell off the
                                                face of the Earth. They may make it
                                                into the playoffs anyway. 

18 Oilers       2.89 3.03 -.14 0.07  88  50  0  Where they always are at this point in
                                                the season: battling for the eighth
                                                playoff spot. Roloson has been good.

19 Kings        2.77 2.92 -.15 0.02  83  21  0  Good defense and a lot of young talent;
                                                they'll be dangerous a few of years
                                                down the road.

20 Hurricanes   2.72 2.88 -.16 -.07  88  53  0  A bubble team. If they improved their
                                                special teams they'd end on the right
                                                side of the bubble.

21 Senators     2.67 2.88 -.21 0.01  79  12  0  Strange to think: only two years ago
                                                they were best team in NHL. Implosion
                                                has been phenomenal. Their offense
                                                needs to somehow get back on track. Ray
                                                Emery can only be blamed for so much.

22 Predators    2.49 2.75 -.26 0.07  82  16  0  Worst offense in the NHL; no truly
                                                dangerous offensive players on roster.
                                                Shea Weber on defense, Pekka Rinne in
                                                goal have been bright spots.

23 Penguins     2.88 3.14 -.26 -.02  83  26  0  Weak defense and goaltending; defending
                                                Stanley Cup finalists may miss the ball.
                                                Have top two scorers in the league ever
                                                both played for the same team and
                                                missed the playoffs?

24 Avalanche    2.81 3.09 -.28 0.05  77   6  0  Goaltending tandem of Peter Budaj and
                                                Andrew Raycroft has been horrible;
                                                injuries to Joe Sakic and Paul Stastny
                                                have been nails in the coffin, both are
                                                shootout experts and should serve them
                                                well in future. Team will miss Sakic
                                                if he retires.

25 Coyotes      2.72 3.05 -.33 0.05  79   9  0  Offense is weak, defense is weak. What
                                                else is there? Bryzgalov has been OK.

26 Rangers      2.49 2.84 -.35 -.04  89  61  0  They're a fraud. One of NHL's worst
                                                offenses and its worst power-play, they
                                                should by all rights be out of playoffs
                                                but luck, Lundqvist winning some close
                                                shootouts, and playing in East means
                                                they may make it after all. Bright spot:
                                                their penalty-killing is outstanding.

27 Thrashers    2.93 3.34 -.42 -.05  70   1  0  How long before they understand you
                                                can't win without defense? Terrible
                                                shots-against; whenever anyone but
                                                Lehtonen steps between the pipes the
                                                result is disastrous.

28 Lightning    2.69 3.19 -.51 -.03  72   0  0  Useless offense and defense unlikely to
                                                be a winner. On positive side, may have
                                                found goalie of future in Mike Smith,
                                                provided he works on his shootout.

29 Maple Leafs  2.97 3.53 -.56 -.02  76   9  0  With a good goaltender, this would be a
                                                playoff team. Unlike teams that have to
                                                rebuild from the ground up, the Leafs
                                                are one good player from contention.

30 Islanders    2.54 3.19 -.65 -.04  62   0  0  Another painful year coming ending in
                                                Long Island. Little to work with on
                                                this roster; next year will likely be
                                                more of the same. Mark Streit, who has
                                                been excellent, is one bright spot.

The top four teams (Red Wings, Bruins, Sharks and Blackhawks) are far ahead of the rest. If they continue playing this way, there is a 70% chance that one of them will be left holding the Stanley Cup in June. The Bruins benefit from playing in the league's weaker conference, which means that their path through the playoffs should be easier.

As a general rule, the Western Conference is much stronger than the Eastern this year, and it shows both in the rankings and in the team schedules: the teams with the toughest schedules are the Blackhawks, Oilers and Predators, while the ones with the easiest schedules are the Capitals, Devils, Flyers and Panthers.

I hope you've enjoyed the inaugural edition of Numbers on Ice. Feedback is always appreciated. Join me next week when we analyze the individual performances that have been responsible for the success (or lack of it) of their teams this year and we dole out the awards at the three-quarters mark of the season!

Tom Awad is an author of Hockey Prospectus. You can contact Tom by clicking here or click here to see Tom's other articles.

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