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Sharks Gameday: The Guess Who Sucked, the Jets Are Back Now Here To Stay

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With the Sharks playing the Jets for the first time this year, the general storyline from the San Jose standpoint will go as follows-- the bitter cold that wraps itself around the city of Winnipeg this time of year, Kyle Wellwood's excellent season thus far, and the Jets return to the NHL after a decade and change of being out of the League.

Winnipeg is freezing right now, we highlighted Kyle Wellwood as a player who destroyed his competition last season with the Sharks, and the Jets return to Winnipeg is a great story for the community that should be celebrated.

So we move on to other things.

With the excellent Gabe Desjardins running SBN's Jets blog over at Arctic Ice Hockey, and FTF adding a terrific writer in The Neutral last month to cover scoring chances and statistical analysis, I figured now was as good a time as any to re-introduce you to a statistic that does a damn fine job of telling us about the success of a player but one that hasn't received much coverage on Fear The Fin.

That statistic is PDO.

PDO is a relatively simple concept to understand, but as Gabe mentions in his article here, it is one of the most powerful statistics we have at capturing things that the eye (and even some advanced statistics) can miss--luck, both good and bad, and the sustainability of that production.

PDO is the sum of a player's on-ice shooting percentage on-ice save percentage while he is on the ice. It regresses heavily to the mean the more games that are played, meaning that a team or player well above 1000 at this point in the year has benefited from good luck and should be expected to come down while a player or team that is well below 1000 has been dealt bad luck and should be expected to come up. The magic number is 1000-- anything that deviates from that by a wide margin is an outlier, a fluke, a scourge, a sign that a correction is soon to come.

Let's use Joe Thornton's season as an example. When Thornton is on the ice at 5v5, the Sharks have a shooting percentage of 8.33% and a save percentage of 93.1%. Some simple addition gets us to the number of 1015. This tells us Thornton has been riding the percentages a little bit, but he isn't so far from the magic number of 1000 to indicate things are about to drastically take a turn for the worse from a goal differential standpoint.

Furthermore, don't think of PDO as solely an offensive or defensive statistic that measures good or bad luck-- a player's on-ice shooting and on-ice save percentage tell us where he lies on that continnum. What PDO does tell us about is a player's goal differential, and it tells us that in spades.

Star-divide

Here are the five Sharks who are furthest from the mean average of 1000 this season (min: 20 GP):


San Jose Sharks PDO Winners and Losers

Player GP
On-Ice SH%
On-ICE SV%
PDO
Martin Havlat
26
7.98 96.9 1048
Jamie McGinn 38
9.35 94.1 1034
Logan Couture
38
7.91 95.3 1032
Marc-Edouard Vlasic
38
8.85 94.1 1030
Jason Demers 28
6.63
90.9 975

The full list of Sharks can be found here.

Martin Havlat (from a defensive standpoint) and Jamie McGinn (from an offensive standpoint) are the two players on the Sharks who immediately jump out as players who have benefitted a whole lot this season from the percentages. They've been riding them like a toaster strudel feline coasting through space (FTF Online Store reference in hyperdrive!), which indicates things will begin to slow down for them this season in regards to goal differential.

Everything requires context of course-- Havlat's miserable and unsustainable 3.2 shooting percentage indicates his personal goal totals should increase with time, but expect that +/- to take a hit when he returns from his hamstring injury sometime in late February if his rehab progresses as expected.

McGinn is a man among mortals and will defy the odds for the rest of his career. You can take that to the bank (just make sure your account is FDIC insured).

Jason Demers has been battered by the percentages this entire season, with his poor luck coming in both the offensive and defensive realms. A lot of that has to do with his extremely rough start to the season of course, but the good thing is that Demers has managed to turn the corner in his play as of late and should receive a nice little regression to the mean bump as well. Expect that team worst -7 to rise during the second half of the season-- it has been foretold in the Book of Gabe.

As we have discussed earlier, the Sharks as a whole have good underlying statistics-- this is a legitimate Stanley Cup contender, and one that outchances their opponents the vast majority of games they play in. Having said that, the Sharks have been the beneficiaries of the percentages at 5v5, with twelve players ending up 10 points above the mean and only two players lying 10 points below.

Certainly this is a testament to the goaltending of Antti Niemi during the season, as well as the strength of the roster. It's also a sign that some difficulties may arise as the second half begins as an overall team PDO of 1014 begins to regress to that 1000 point sweet spot.

With 16 out of their next 22 games on the road, things aren't going to get any easier for San Jose. Following a loss to the Wild that saw them get outplayed for the majority of the game, they'll look to rebound tonight in one of the louder buildings in the League.

Prediction: Sharks win 4-1. Goals by McGinn, Mitchell, Marleau, and Demers. I listen to The Weakerthans all day.

Comment 34 comments  |  1 recs  | 

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I like that song!

Great writeup! PDO is certainly a interesting stat to look at.

by Justboo on Jan 12, 2012 5:14 AM PST via iPhone app reply actions  

Sharks are going to regress to the mean?

This is not the Public Display of Optimism I was hoping for.

by Cloweture on Jan 12, 2012 7:35 AM PST reply actions  

I saw Jibblescribbits tweet about this last night

The bruins have 10 of the top 15 players in the league with PDO’s over 1000… sorta explains their goal differential.

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by Evilducks on Jan 12, 2012 7:55 AM PST reply actions  

5x5

The Sharks 5×5 play has been fantastic this season and it needs to be that way if they want to succeed in the post season.

As for the game tonight, I’ve had the damn Jet Song stuck in my head for 2 days!!! The Jets have been very good at home, the Sharks will need to play a smart road game tonight to come away with a win.

by milanahalek on Jan 12, 2012 8:05 AM PST reply actions  

Should be a good game...

I have heard nothing but great things about the crowd noise in Winnipeg so I’m looking forward to hearing and seeing how the Sharks respond.

Let’s hope Nemo has shaken off Tuesdays crappy game. GO SHARKS!!!!!

Waiting for the Cup to come to SJ since 1991...

GO SHARKS!

Find me on Twitter @njahoda

by winthecupsj on Jan 12, 2012 8:40 AM PST reply actions  

It'll be wild there

Certainly helps make the games entertaining to watch. We’ll see Jumbo booed every time he touches the puck (they boo every opposing team’s captain relentlessly), and the Jets have been playing quite well. Controlled the game in Boston the other night through two periods, but then gave it up when the Bruins went wild in the 3rd. Interesting to see how they respond after that.

Bogosian might be out with a lower body injury—he’s really picked up his game this year.

Winter. Time to eat fat and watch hockey. -- Margaret Atwood

by Timorous Me on Jan 12, 2012 10:41 AM PST up reply actions  

OT - All Star selection

Couture is the lone all star for the Sharks. Here’s the list:
http://www.nhl.com/ice/page.htm?id=76666

by milanahalek on Jan 12, 2012 10:09 AM PST reply actions  

Congrats to Couture

Very deserving. I really wish Vlasic had made it, but otherwise it’s hard to argue—lots of talented guys on that roster. I’d swap Vlasic for Byfuglien, but if we’re trying to get one representative from every team, I guess that’s the way it goes (though I’d give the selection to Kane instead).

Winter. Time to eat fat and watch hockey. -- Margaret Atwood

by Timorous Me on Jan 12, 2012 10:36 AM PST up reply actions  

One selection from every team

Colorado, Min and Edmonton (weakest Div in the NHL) only have 1 and Co, Edm only have 1 rookie each in there (meaningless)…

by 408sharks on Jan 12, 2012 11:12 AM PST up reply actions  

Threw up a fan shot about this as I hadn’t seen your link.

Very pleased for Couture, but agree with the view it would have been a nice honour for Pickles as well. Mind you, if Vlasic flies under the league-wide radar a bit I’m not too unhappy with that.

And you think you live in a non-traditional hockey market...
"I flew 5,000 miles for this?"
And if you want more of this kind of thing, I'm spouting nonsense on Twitter too...

by BritShark on Jan 12, 2012 10:39 AM PST up reply actions  

Screw the All Star Game

Let the guys stay home and heal up instead of participating in a pointless media exercise.

GO SHARKS!

They're not getting this kind of coverage at "Hockey Night In Canada" folks! - Randy Hahn

Changing signatures is for suckers.

What Jay Leach is to the San Jose Shark's Defense, I am to Fear The Fin's Mod Squad.

by ElvisVF101 on Jan 12, 2012 12:15 PM PST up reply actions  

I salute you!

I’ve been waiting what, 15 years, and we’ve gone all week with no mention from the FTF crew about West Side Story?!? Where is the love! Where is the humanity! Most importantly, how has a West Side Story style snapping fight video not appeared in the main columns!

408, at least your bringing some sanity to an insane world.

by ninjafuzz on Jan 12, 2012 11:26 AM PST up reply actions   1 recs

Just was reading a New Yorker Talk of the Town piece on gangs in Britain being more “Sharks vs. Jets than Bloods vs. Crips” when it dawned on me that, shamefully, I, too, had forgotten this.

So yes, thank god somebody is on top of this.

Winter. Time to eat fat and watch hockey. -- Margaret Atwood

by Timorous Me on Jan 12, 2012 2:09 PM PST up reply actions  

The Jets at home...

Winnipeg probably has one of the most enthusiastic and passionate arena of fans in all the NHL, so scoring first will probably go a long way for the Sharks – and of course a complete sixty minute road-worthy effort to ensure success. Yep, easier said than done, and probably just stating the obvious, but still rings true, yes?

Anyway, my last summary of San Jose’s last defeat generated some very disagreeable responses, and that is fine – looking over my comments and analyzing the replies, yes, I was probably disproportionate in my perhaps overly stark synopsis of San Jose’s play.

We have been swimming these wintry depths for years, succeeding at survival by feeding only upon perennial minnows of sustenance... will we ever get to sink our great white teeth into this so-called Stanely's feast, so that we may finally slay our insatiable hunger in frenzied celebration?

by Deep Waters on Jan 12, 2012 12:21 PM PST reply actions  

I wonder what Boston's team PDO is

What with Tim Thomas’s sv%. It does seem to defy intuition to claim that no matter what, everyone regresses to the same 1000. Like, take the bruins playing in front of Tim Thomas. Now have them playing in front of, I dunno, Dwayne Roloson. I feel like the team would get pretty different PDO, pretty sustainably, since their shooting percentages shouldn’t change terribly much, but their sv% sure as hell would.

by warning on Jan 12, 2012 12:22 PM PST reply actions  

Reading up

the claim is that differences in talent in shooting ability and save ability are so minimal that shot production/prevention will dominate. And that just seems… well I don’t really believe it on two levels. You have people with very high career shooting percentages and very low career shooting percentages, partly due to style of play and partly due to talent and it doesn’t seem to follow that snipers are necessarily terrible at playing defense (at least insofar as allowing amazing chances against due to bad play). Neither does the inverse seem to be logical (that those who just shoot whenever they get the chance and depress their shooting percentage by reducing shot quality are necessarily going to prevent more good chances from the other guy.

And all that just implies that it would be totally possible to maintain a career PDO away from 1000, because tons of players have very different career shooting percentages.

Second, some styles of team play seem to favor shot quantity over quality, so regardless of talent, I feel like the system could have a sustainable effect on PDO. Obviously there’s going to be regression to some number, but I don’t feel like it’s necessarily going to be 1000.

And sure, I really have no evidence except some basic logic to support this, but I haven’t seen proof of concept for PDO. Which is to say, I’d like to see it, not that I don’t believe there can be any.

by warning on Jan 12, 2012 12:39 PM PST up reply actions  

You can take a look at all of the team numbers on Behind The Net here:

http://behindthenet.ca/S.J_2011.html

The graph you want to be looking at is on the right side, and the “PDO” column you want to focus on is at the bottom of the page.

As you correctly state, things differ between teams. A goaltender like Tim Thomas (who has defied pretty much every statistical prediction made of him considering he’s well on the wrong end of 30 years old) does effect those numbers. Shooting percentage for individual players (Ilya Kovakchuk being a prominent example) also presents a case where the mean of 1000 might not be relevant.

With all that being said, especially when you look at data on a team-wide basis (and even more so over an extended period of seasons) PDO is insane at predicting outcomes. Browse the data and you will be floored at how powerful it is.

"The world is a comedy to those that think; a tragedy to those that feel." - Horace Walpole
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by Mr. Plank on Jan 12, 2012 1:00 PM PST via iPhone app up reply actions  

Okay I guess that sort of shows my point though

I don’t doubt regression to some mean for an individual team. But look at that graph – it doesn’t look at all like it’s regressing towards 1000. In fact just looking at the graph provides very compelling evidence that the sharks should expect a PDO for the remainder of the season of exactly what it is right now, barring major roster changes or wild swings in Niemi’s play.

Put it another way. At the start of next season, if you take the shooting percentage and shot total of each player, you should be able to calculate an expected average team shooting percentage. Similarly, by using the career numbers of the starting goalies, we can calculate a career save%. I would bet that by adding these numbers, we can do a decent job predicting which teams end up with the highest PDO at the end of the year. And if that’s true, then it’s not a stat that’s purely based on luck.

by warning on Jan 12, 2012 1:11 PM PST up reply actions  

It’s not an “absolute” stat…there aren’t any stats out there that can tell you exactly what players will do in the future. But, as far as stats go for predicting future outcomes, it’s probably the best one out there.

Last season there were still 140 or so players who’s PDO was at or over 1010 (players who played at least 60 games).

by milanahalek on Jan 12, 2012 1:07 PM PST up reply actions  

Obviously

But I’m claiming that it’s not a “pure luck” stat which is what it would need to be for everyone to regress to the same number. I’m not saying people will vary much from 1000, I’m just saying that some variance is sustainable.

by warning on Jan 12, 2012 1:12 PM PST up reply actions  

Ah

Ya…I have a hard time believing shooting % and save % are primarily luck driven, but that’s just my opinion and I don’t have stats to back it up.

by milanahalek on Jan 12, 2012 1:19 PM PST up reply actions  

Save% tends to regress to a goaltender’s true talent level so in that sense there are certainly teams whose PDO ratings will consistently surpass 1000.

For anyone who’s curious, over the past four seasons combined, the highest average 5v5 team PDO belongs to Vancouver at 1015 and the lowest belongs to the Islanders at 985. Obviously there’s been tons of player movement and coaching changes throughout the league during that time but I’d probably define those as the upper and lower bounds of true PDO ability (or lack of ability).

by The Neutral on Jan 12, 2012 1:54 PM PST up reply actions  

Sounds reasonable

And those are very significant numbers. If two teams shoot 30 shots each during a game, that’s a net of .45 goals per game for one team, or 37 in goal differential.

My only point was that it doesn’t seem very much like a luck stat and I doubt the sharks will regress towards 1000.

by warning on Jan 12, 2012 6:26 PM PST up reply actions  

That's a cool story

If you mention ending your life, or show signs of self-harm, I will take you seriously!
"Take a deep breath sometimes, a break, and play some hockey. Hockey is a great way to take a pause from day-to-day hard work." -- Lt Gen. D.H. Huntoon Jr. (paraphrased)
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Shameless plug for my music.

by Soloact on Jan 12, 2012 3:36 PM PST up reply actions  

The Jets

Is Rex Ryan the Jets coach? Whoops, wrong sport! Still though lets defeet them!

by ninersdd on Jan 12, 2012 4:07 PM PST reply actions  

I wish I could support the findings in this article, but it turns out that stats are for losers. Mandatory-weekly-hockey-blog-specific-meme-quota requirements aside, um well I kind of just wanted to say that. Glad there is some Sharks hockey today.

by aMinorThreat on Jan 12, 2012 4:38 PM PST reply actions  

BOOOOOOO!

"Logan Couture is a dirty, filthy man. Tell all your friends" - Mr. Plank

Welcome to the NHL, Atlanta Thrashers of Winnipeg.

by Bockerz on Jan 12, 2012 5:28 PM PST reply actions  

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