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Avalanche Finally Tumble

This guy would have known that the Avs collapse was coming.  via upload.wikimedia.org

The Colorado Avalanche defied conventional wisdom for about two-thirds of the season.  A young team, picked by most to finish last in the division or last in the conference, the Avalanche toyed with first place for a couple of months and were solidly entrenched in a playoff spot for five months.  A number of very good hockey minds tried to explain the ins, outs and what have yous of the flaws that Colorado.  From Gabe's post:

I know nobody wants to hear this, but I'm concerned that Colorado's success is illusory.

And right he was.  Colorado squeaked into the playoffs on the soft schedule, even though the goaltending didn't hold up.

Everyone knows that Colorado had some incredible luck through the first two-thirds of the season.  From the beginning of the season through January 24th, the Avs had 66 points in 51 games, or 1.29 points per game.  Avs fans were talking about a 105 point season.  Through the same period, the Avs Corsi percentage was .422 - they were getting absolutely shelled at even strength.  But Colorado's even strength save percentage of .932 (thanks Craig Anderson!) kept them from being Blue Jackets-level awful. 

Star-divide

 

The overall team PDO of 102.6 wasn't going to be sustainable as Gabe said, but Avs fans did not go quietly into that good night.  Instead they began defending the team with inane excuses like "depth of scoring", "a puck possession style", "Coach Sacco's will", "Craig Anderson really is an elite goalie", and a game plan that included getting outshot in the third period. 

That was the end of the good times though.  Colorado started to collapse and hung on for dear life to get into the playoffs.  From January 28th on, the Avs Corsi percentage was .486, meaning they improved in the shooting department, yet they were still being outshot handily.  What was the source of the improvement?  From Scott's last post on Colorado:

But I do think they'll make the playoffs.  The Avalanche are much better at home than they are on the road and have a favourable schedule in that regard (15 at home and 11 on the road).  They also don't have the toughest schedule with 12 games left against teams outside of the top 9 in the West or top 5 in the East.  Basically, if their goaltending can stay strong, they should be able to maintain .500 hockey.  If they do that, their odds of making the playoffs are over 90% which will make them one of the worst teams to make the playoffs since the league expanded to thirty teams.

Essentially, Colorado got to face a large number of soft opponents.  Even though the schedule got softer and the shots rate strengthened, Colorado's performance faltered.  From January 28th through today, Colorado has 27 points in 28 games, or .964 points per game.  The even strength save percentage during that span has been .916 and talk of Anderson as an "Elite goalie" has disappeared.  The team PDO in that stretch is 100.1 and the Avs have been a 79 point team rated out for a full season.

Scott's prediction was bang-on, by the way.  The Avs held on for dear life and claimed the last playoff spot (thanks Sutter brothers!), but they are one of the worst teams to make the playoffs in the last 10 years.

I appreciate the "little engine that could" side of this story, but in the end, I wish that Colorado would have slipped out of the playoffs.  Colorado fans can now hold on to their delusions, rather than gaining a deeper understanding of what was actually going on during the first four months of the season.  Although the slide was a lesson in math to most, falling completely out of the playoffs would have driven the point home to even Avs fans.  You can briefly live on the whale tail, but eventually it all comes tumbling down.

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And as much as I would have loved seeing the whole “Getting horrifically outshot and outchanced can be a sustainable way to win hockey games” theory not end up in the playoffs, the alternative was Calgary making it, so screw that.

Irrational rivalry hate > Intellectual desire for karmic justice

by MattM on Apr 7, 2010 11:52 AM MDT reply actions  

I considered that, but quite frankly, Avs fans are more annoying this year.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 7, 2010 8:06 PM MDT up reply actions  

Well, somebody’s off the Christmas card list…

The Avalanche, clearly, are down with No PP.

by Mike @ MHH on Apr 8, 2010 9:47 AM MDT up reply actions  

You can briefly live on the whale tail, but eventually it all comes tumbling down.

I couldn’t find a copy anywhere in Kelowna; in fact, a computer at Chapters seemed to think they were fresh out all across western Canada.

I am about 120 pages into The Black Swan, thanks to your urging.

by Passive Voice on Apr 7, 2010 12:18 PM MDT reply actions  

Oh god, not you guys too with that Corsi crap…. ugh.

Screw the Wings. Screw Lidstrom. Screw Franzen. Screw Holmstrom. Screw Zetterberg. Screw Datsyuk. Screw Osgood. Screw Howard. Screw May. Screw Kronwall. And Super Double Mega Screw Bertuzzi (May God NOT have mercy on his sick twisted warped soul). Did I miss anyone?

by i2strange97 on Apr 7, 2010 1:44 PM MDT reply actions  

Well, this one convinced me. Corsi is meaningless! Meaningless!

by Scott Reynolds on Apr 7, 2010 2:02 PM MDT up reply actions  

See. Look how easy that was.

Screw the Wings. Screw Lidstrom. Screw Franzen. Screw Holmstrom. Screw Zetterberg. Screw Datsyuk. Screw Osgood. Screw Howard. Screw May. Screw Kronwall. And Super Double Mega Screw Bertuzzi (May God NOT have mercy on his sick twisted warped soul). Did I miss anyone?

by i2strange97 on Apr 7, 2010 2:51 PM MDT up reply actions  

Did you also gloss over the save percentage bit? The PPG?

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 7, 2010 8:07 PM MDT up reply actions  

If anything, shouldn’t the Avs’ success, as illusory as it may be, be a positive point in an otherwise dismal season for the Oilers? The prospect of a quick turnaround from worst in the west to a playoff spot is at least something to hope for. This article just sounds like sour grapes.

by thereverend on Apr 7, 2010 2:46 PM MDT reply actions  

Yup. I made up the shots data, the PPG, the save percentage all because of sour grapes.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 7, 2010 8:07 PM MDT up reply actions  

This season-long lecture keeps reminding me of some Czech jokes

Or at least the math was always convincing, but the context always sounded like one rival telling another (as rivals do): “No point enjoying those wins. It won’t last.” Which made the Avs fan reaction hardly surprising.

The first joke:

American says to a Czech: “Isn’t the weather today just gorgeous? Nice breeze, blue skies, fluffy clouds, so much to enjoy outside today.”
Czech replies: “Why bother? They say it will rain tomorrow.”

Second joke (which is better, I promise):

An American, an Italian and a Czech find a genie bottle on the beach. They rub it, genie comes out, says “I can grant three wishes, so you guys only get one each.”
American says: “My neighbor, he has this gorgeous blonde wife. I’m always staring at her across the lawn. Great body, nice rack, fun to be around. I just want a wife like that.” Genie grants it.
Italian says: “My neighbor, he has this beautiful car. So sleek, so fast, so sexy. I’m always staring at it in the street. I just want a car like that.” Genie grants it.
Czech says: “My neighbor, he has this great pig. Prize-winning pig, always winning him awards, making him money, the talk of the village. I’m always staring at it across the fence. I just want that fucking pig to die.”

Lighthouse Hockey: What's wrong with lotteries? I've been in lots of lotteries.

by Dominik on Apr 7, 2010 3:29 PM MDT reply actions  

Its interesting that although the Avs are ‘tumbling’, they are tumbling in a way that is actually statistically better than when they were winning.

Consider that in the first 15 games of the season the Avs were outshot 24 to 33. In their bad post-Olympics stretch they have been outshot 30 to 33. Further if the games where they built a big early lead are excluded (the 7-2 rout of St Louis and being 4-0 up against Dallas), the difference becomes only 30 to 31. Season long the Avs are outshot 28 to 32 – which is bad.

These two stretches of season would appear apt for comparison as in both cases they played a similar number of fellow Western playoff teams (8/15 and 9/18 respectively), but had very different results (torrid luck v lots of losses).

Yes, the Avs did get by on luck early on – but they are improving, as primarily youthful teams are expected to.

Colorado fans can now hold on to their delusions, rather than gaining a deeper understanding of what was actually going on during the first four months of the season

There aren’t delusions in general with Avs fans – like Dom says, when there is a dominant culture of undermining your overachievements in the stats-based hockey community, it can generate the expected reaction (defence of one’s position).

by HugoAgogo on Apr 7, 2010 4:24 PM MDT reply actions  

Interesting how the Avs Corsi % went up at the same time their Pts % was coming down. I wonder how much of that is score effects. I saw quite a few games early in the season where the Avs were hanging on to a one-goal lead, whereas recently it’s more often been them trying to come from behind (as in last Sunday’s Calgary game, where Colorado was storming the Bastille in the third). In a small sample like 2/3 of a season vs. 1/3, surely it’s bound to have an effect?

Writer for The Copper & Blue and primary shareholder of Zorg Industries

"Never be ashamed of who you are" -- Jean-Baptiste Emanuel Zorg

by Bruce McCurdy on Apr 7, 2010 4:28 PM MDT reply actions  

I wonder how much of that is score effects.

Well, it’ll be lots of it but that’s to be expected I’d think.

by Scott Reynolds on Apr 7, 2010 4:47 PM MDT up reply actions  

Exactly. I’m just musing as to whether the Avs early success could in fact have been driving their Corsi in the negative direction. I’m not just talking about success early in the season, but early in games. Check out their GF/GA by period:

COL * 72 – 90 – 66 – 2 = 230
OPP *
63 – 68 – 83 – 2 = 216

The third period has been by far their worst both offensively and defensively, but in part that would be driven by the Avs holding a net 31-goal advantage over the first 40. I would guess that if you looked at their Corsi by period, it would be meh in the first two periods but really be crappy in the third when score effects are at their most imperative.

Moreover, check out Leading/Trailing stats at NHL.com and one can see that the 12th-overall Avalanche have led 40 games after 40 minutes, which is the most of any NHL team. They have trailed after 40 in just 23 games, the second fewest of any team. Which also supports the notion they’ve spent a lot more time hanging on than coming on.

Add it all up and I think these stats support the notion that Colorado is an average team that is not as good as its W-L record indicates, but also is not as bad as its Corsi stats indicate.

Writer for The Copper & Blue and primary shareholder of Zorg Industries

"Never be ashamed of who you are" -- Jean-Baptiste Emanuel Zorg

by Bruce McCurdy on Apr 7, 2010 5:33 PM MDT up reply actions   1 recs

The theory is a good one and true to some extent but the Avs are still really bad looking at only data with the score tied. I recognize that’s not the same as going period by period, but it’s another way of trying to take out the “playing to the score” factor. At any rate, they have a Corsi% of 44.3% – which is awful – when the score is tied compared to 44.6% overall. The shots data is the same, with the score tied they’re at 45.6% and they’re at 46.3% overall. There’s some effect for sure but it’s not enough to move them into the realm of respectable.

by Scott Reynolds on Apr 7, 2010 8:09 PM MDT up reply actions  

And they get pummeled in the chances department.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 7, 2010 8:16 PM MDT up reply actions  

The best part is… I DO watch the games!

by Scott Reynolds on Apr 7, 2010 8:24 PM MDT up reply actions  

Essentially, Colorado got to face a large number of soft opponents.

Don’t the Avs and the Oilers have very similar schedules since they’re in the same division? Or am I missing something here?

A woman drove me to drink and I didn't even have the decency to thank her.

by smoky201 on Apr 7, 2010 4:35 PM MDT reply actions  

The Oilers ARE the soft opponents.

by edm_euler on Apr 7, 2010 4:48 PM MDT up reply actions   1 recs

I’m assuming he meant their schedule over the last 26 games. The Avs played a lot of tough teams and road games at the start of the year which gave them an easier schedule down the stretch than some of the other clubs they were competing with.

by Scott Reynolds on Apr 7, 2010 4:51 PM MDT up reply actions  

Just a question – how effective is using top 9 in Western Conference as a criteria for looking at early season schedule?

Also, is it the strength of the teams their performance at the beginning of the season (based on small sample size) or the broader season long performance (which doesn’t take into account the disproportionately good/bad performance after the games are played)?

by HugoAgogo on Apr 7, 2010 5:03 PM MDT up reply actions  

I was using the top nine teams with 26 games left because there was a significant disparity between the totals of the top 9 teams and those below them. I was more or less trying to ball-park strength of schedule for the stretch run. They also had a lot of home dates compared to average at that point. Overall, I don’t think it’s too controversial to say that the Avs had a tougher schedule over their first 56 games than in their last 26.

by Scott Reynolds on Apr 7, 2010 8:23 PM MDT up reply actions  

Overall, I don’t think it’s too controversial to say that the Avs had a tougher schedule over their first 56 games than in their last 26.

I don’t debate this, because of the home and away split being very favourable to the Avs.

But if you just look at the teams any team plays – its hard to know whether to use the small sample or the larger sample as being more indicative of a team’s true strength. Basically, I’m wondering whether there is evident to suggest that hypothetically playing 10 teams that eventually make the playoff in the first 15 games is equally tough as playing the same 10 out of 15 later in the season (with identical schedules)?

I guess I’m just curious if you stats-heavy guys have any evidence to suggest which way is the ideal manner to evaluate team strength…?

by HugoAgogo on Apr 7, 2010 9:12 PM MDT up reply actions  

I think I understand your question and to answer (hopefully), I don’t know of evidence to suggest a general pattern in either direction (better to play teams that end up with good records early v. late in the season). In general, the larger sample will be the most predictive though at some point “the past is the past” so to speak. I was more just ball-parking with the assumption that most bad teams would continue to be bad and most good teams would continue to be good over the last 30% of the season. In some instances this might not be the case (injuries, luck, legitimate improvement or regression…). It was surely better to play the Oilers, for example, after Khabibulin and Hemsky were injured than it was to play them before that. They were bad either way, but the degree was surely different.

by Scott Reynolds on Apr 8, 2010 5:21 AM MDT up reply actions  

This is one of those tough questions with hidden variables I love (and hate). I mean, I think your ballparking is the best bet, but it’s fun to probe whether a record is hiding things.

For example, the Isles have a relatively decent record against the West this year. But one win was against the wounded and flu-ridden Oilers, one was a blitzing of a sleepwalking/travel-weary Red Wings squad, one was a shootout win over Phoenix that featured a seven-minute powerplay, another a late victory in Colorado, another a goaltending thievery against Chicago…

Lighthouse Hockey: What's wrong with lotteries? I've been in lots of lotteries.

by Dominik on Apr 8, 2010 9:46 AM MDT up reply actions  

I was always curious about how strength of schedule is compared across the season. Clearly as you and Dom say – context is key.

Cheers, Scott.

by HugoAgogo on Apr 8, 2010 4:09 PM MDT up reply actions  

I even quoted and linked to Scott’s post for context.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 7, 2010 8:18 PM MDT up reply actions  

Would I be a bad person if I said that the Avs actually are better than their Corsi makes them look?

by Benjamin Massey on Apr 7, 2010 4:55 PM MDT reply actions  

No, they probably are. If they were as bad as their Corsi they’d be truly awful, and they aren’t awful. They’re just not that good. Closer to the Blues than the Blackhawks.

by MattM on Apr 7, 2010 4:59 PM MDT up reply actions  

See what I wrote up the page before I read these comments. (5:33 p.m. MDT) Sounds like we’re seeing the same thing.

Writer for The Copper & Blue and primary shareholder of Zorg Industries

"Never be ashamed of who you are" -- Jean-Baptiste Emanuel Zorg

by Bruce McCurdy on Apr 7, 2010 6:12 PM MDT up reply actions  

You’ve been victimized by sample size.

They are truly bad. They get hammered at even strength by shots and scoring chances. I don’t understand how you can look at the above numbers and think that what you’ve seen in the games you’ve watched overrides that.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 8, 2010 9:51 PM MDT up reply actions  

Yes, but part of the hammering is likely the result of them having the lead a disproportionate percentage of the time relative to their true talent. They’re not a Chicago or a Detroit who can outshoot and keep on outshooting. Their MO has been to get the lead and hang on. They’ve likely had more than their share of luck in getting those leads, but those leads then have score effects on Corsi.

I’m not saying they haven’t been lucky. I am saying the chasm between their goals totals and their shots totals is probably exaggerated.

Writer for The Copper & Blue and primary shareholder of Zorg Industries

"Never be ashamed of who you are" -- Jean-Baptiste Emanuel Zorg

by Bruce McCurdy on Apr 8, 2010 11:13 PM MDT up reply actions  

The question becomes degree. From what I can tell your instincts are right here but that the degree to which it’s impacted their overall results isn’t overly large. At least, not if you consider “score tied” results a good way to factor out “playing to the score” as a variable.

by Scott Reynolds on Apr 9, 2010 12:16 AM MDT up reply actions  

Again, with the score tied, they get hammered. It has nothing to do with the lead. When the score is tied, they are worse by the shots data.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 9, 2010 6:50 AM MDT up reply actions  

I doubt many Avs fans would disagree with this. It’s a flawed team, and the warning signs have always been there: this team has terrible defensive schemes and defensive players in too large of roles. The reliance on Corsi numbers to show how “awful” the Avs are makes me roll my eyes still, as Corsi itself is a limited measuring stick. I feel like beating people over the head with correlation vs. causation lectures. Perhaps we shouldn’t be asking how the Avs overcome their poor Corsi numbers, but why Corsi has failed to predict accurately in their case.

Most of all, I just don’t quite get the glee from all corners for pointing this out. Shouldn’t the story be how the Avs are still absolutely blasting preseason expectations? How they’re so far ahead in year 1 of a rebuild? I swear, it feels like sour grapes from people that look bad at picking the Avs last in the west…

by thedoctor on Apr 8, 2010 1:43 PM MDT up reply actions  

It’s not glee at all. It’s that a number of people (Scott, Derek, Vic, Tyler, Kent, Willis et al ad infinitum) are trying to tell you that some things in this world are luck-driven and some are talent-driven and that you conflate the two at your peril. In particular, people want you to know that high individual shooting percentages are bound to come crashing down to earth and that what you really want is to control the puck.

It’s also important to break through the confirmation bias that so plagues hockey fandom. The Avs didn’t have any special talents that no other team had in the past – they rode good goaltending and a lucky shooting streak about as far as they could.

I agree that Corsi is a limited measuring stick, but what’s more limited is concepts of “grit”, “determination”, “having nothing to lose”, “young kids having fun” and “hot shooting”.

The other thing here: the link between Corsi and team talent is causal. Teams with poor Corsi don’t have the puck and their opponents do, which makes them bad teams. This isn’t some secondary correlation indicative of some other issue.

by Hawerchuk on Apr 8, 2010 2:15 PM MDT up reply actions  

All that is true, but the underlying tone from the vast majority of the posts here, at BTN, and @TR is that Avs fans are delusional and should significantly tone down our jubilation on having over-performed and reached the playoffs. I have not, nor will I ever, preface or append my shit-talkin’, mouth-breathing support of the Avalanche with “Even though it’s all a giant pile of luck.” That’s not how I, or any other self-respecting FAN, should ever be told to support my chosen team.

I’m not saying you (or anybody else) are doing it in an explicit manner, but the barrage of posts and comments from the beginning of the season throughout the blogosphere are laden with “YOU’RE NOT THAT GOOD, SO STFU” sentiments. If that was a universal law I’d have killed every Detroit fan I’ve had the misfortune to run across in the last two decades.

My memory is that the statistical proofs started well in advance of any genuine enjoyment of the team’s success and that tends to ruffle some feathers of the faithful. At the end of the day, there are two realizations that both sides of the coin need to make:

1) The statistics don’t back up the success of the team
2) the team was still successful.

The Avalanche, clearly, are down with No PP.

by Mike @ MHH on Apr 8, 2010 2:47 PM MDT up reply actions   1 recs

dude, you are smoking something. here’s what I wrote about the 2009-10 Avs:

http://www.behindthenethockey.com/2009/10/29/1106363/colorados-hot-start

That’s a pretty detached piece, talking about whether they were a 90-point team (like the bookies thought) or if perhaps they were a 98-point team. I didn’t touch on shot counts at all (mostly because they’re not very meaningful during a stretch where you win all your games.)

Here I talked about how Kyle Quincey was getting shelled:

http://www.behindthenethockey.com/2009/11/3/1108617/kyle-quincey-1-defenseman

And then four months later, I talked about how they had an historically high save percentage and shooting percentage:

http://www.behindthenethockey.com/2010/3/16/1370883/colorado-avalanche-worried-yet

I looked into why that was and concluded that they were a playoff bubble team and probably wouldn’t win a playoff series.

There’s a lot of luck in hockey. And sometimes all of that luck goes a team’s way. It’s my job (literally, it is my job) to determine how much is luck and how much is true talent. If you, as a fan, find it enjoyable to believe that outcomes match talent, that’s your business. But I don’t see how we gain any understanding of the game if we ignore luck.

by Hawerchuk on Apr 8, 2010 3:19 PM MDT up reply actions  

Take yourself out of the fan’s shoes and put yourself in a general manager’s shoes. His team has been winning, but they’ve been getting shelled. Do you think he’s sitting there telling himself how great it is to be winning? Or do you think he’s worrying about how long it’s going to take for his team’s bad play to catch up with him?

I can tell you it’s the latter. Hockey guys look at turnovers, breakouts, forechecks, shots – all factors related to puck possession. And when their teams do poorly on those counts, they let them know – regardless of the score.

by Hawerchuk on Apr 8, 2010 3:31 PM MDT up reply actions  

“the link between Corsi and team talent is causal.”

that is one wildly bold blanket statement. it’s statements like those that cause my skepticism of the “Corsi community,” for lack of a better term. it’s statements like that that make me laugh at the over-reliance (almost bordering on worship) it inspires.

it’s an imperfect tool attempting to predict one thing (puck-possession) that is then applied to predicting another (wins and losses). It’s pretty good at correlating those, from what I see. but to call that link causal is laughable. to be unable to admit that it can indeed be a poor predictor, makes even more laughable.

by thedoctor on Apr 8, 2010 3:16 PM MDT up reply actions  

I think you’re unclear on what causality is. If a team controls the puck and controls the shot board, we should expect them to win. Winning primarily comes from having the puck. That’s a causal relationship.

There is also a causal relationship between high shooting percentages and winning, but high shooting percentages are luck-driven (as I pointed out to you, there’s no correlation between even- and odd-numbered games) while shot counts are driven by talent.

You’re really projecting onto me here with this notion of “worship.” I think Corsi explains about half of winning, and the rest is luck and data that we don’t capture. And I’ve taken great pains to show my work publicly. On the other hand, you are presenting no evidence for your alternative analysis of the game. But who needs evidence?

Good thing NHL teams use Corsi and count scoring chances. Maybe you should take your argument to coaches and general managers and see what they say.

by Hawerchuk on Apr 8, 2010 3:28 PM MDT up reply actions  

is this some bizarro definition of causality?

possessing the puck and winning are events that usually happen together, correlated events. merely possessing the puck more than the other team does not cause a win though, scoring more goals than the other team does.

I certainly agree possessing the puck more correlates with scoring more, but I don’t agree that’s a causal link. how are you proving causality from this?

by thedoctor on Apr 8, 2010 4:55 PM MDT up reply actions  

You take the puck. You shoot the puck. You score. You win. It’s not some roundabout process.

All we’ve established here is that there’s a very high standard for me to write anything, and there’s no standard for you to write something.

by Hawerchuk on Apr 8, 2010 5:03 PM MDT up reply actions  

cool down bro, no need for insults.

if X, then Y must occur. That’s my best recollection of a causal link from school.

my example, if (team A scores more than team B) then (team A winning) must occur.

but the statement if (team A posesses the puck more than team B) then (team A winning) must occur is illogical.

by thedoctor on Apr 8, 2010 5:24 PM MDT up reply actions  

Now, I’m no whiz with this lingo but can’t you have a causal relationship by some kind of degree as in:

If (team A possesses the puck more than team B) then (team A winning) is more likely to occur.

Wouldn’t that still be a causal relationship? (Maybe it has a fancy name like partially causal or something).

by Scott Reynolds on Apr 8, 2010 5:47 PM MDT up reply actions  

i don’t think that’s causality from what I recall. the degree to which 2 events are likely to occur in proximity to each other, i.e. what you’re describing, is correlation.

i’ll just paste wikipedia on the topic, they would say it far better than my “standard-less,” writing :)

The conventional dictum that “correlation does not imply causation” means that correlation cannot be used to infer a causal relationship between the variables. This dictum should not be taken to mean that correlations cannot indicate the potential existence of causal relations. However, the causes underlying the correlation, if any, may be indirect and unknown, and high correlations also overlap with identity relations, where no causal process exists. Consequently, establishing a correlation between two variables is not a sufficient condition to establish a causal relationship (in either direction). For example, one may observe a correlation between an ordinary alarm clock ringing and daybreak, though there is no causal relationship between these phenomena.

by thedoctor on Apr 8, 2010 6:02 PM MDT up reply actions  

It seems to me, then, that the problem here is one of semantics. I know for a fact that Gabe does not mean to imply that “if you possess the puck more you will always win” because that would be stupid. He does mean to imply “if you possess the puck more you are more likely to win” which has been demonstrated a number of times by various folks. This is what “Corsi leads to winning” means in general from anyone in the Corsi community whether they use the word “causal” or not. I have never heard anyone seriously argue that there is a 100% causal relationship between Corsi and winning wherein the outshooting team always wins. If you’ve consistently had that impression then you probably just aren’t reading their arguments very carefully.

by Scott Reynolds on Apr 8, 2010 6:25 PM MDT up reply actions  

If you’ve consistently had that impression then you probably just aren’t reading their arguments very carefully.

I understand that’s what most “Corsi community” people believe. but Hawerchuk did just argue that:

The other thing here: the link between Corsi and team talent is causal

there’s really no way to spin that, even when taken in context. It’s either ignorance of what causality is, like you say, or a serious lack of understanding of the relation of it to correlation. Judging from this conversation, seems like it’s some of both to me. Either way, I’m done explaining basics and treating people ignorant of those basics as experts in the subject matter.

thanks for the discussion, and good luck on the scoring chance project — I remain massively impressed with the undertaking.

by thedoctor on Apr 8, 2010 8:48 PM MDT up reply actions  

I feel like you’re just stringing together words here.

You say there’s no causal link between taking a lot of shots and scoring a lot of goals. So I ask what the link is. And you say it’s “shot quality” and that’s what applies to the Avs. So Scott says he watched 40 Avs games and recorded the scoring chances and found that Colorado was not doing anything special there.

And so then you said scoring chances are not the be-all and end-all of scoring. And I asked you what is, and you said “Do you ever watch hockey?”

Are you actually a computer program designed to annoy me?

by Hawerchuk on Apr 8, 2010 11:48 PM MDT up reply actions  

Just to re-state:

Alarm clock ringing : daybreak

as

Taking a lot of shots close to the net : scoring goals

And so scoring goals is not directly related to scoring chances, but happens via some unknown and indirect process? I don’t think a lot of people are going to be on your side if you start postulating that.

by Hawerchuk on Apr 8, 2010 7:09 PM MDT up reply actions  

hilarious attempt at a straw man, but that’s exactly what it is, a straw man. if you can’t determine how that example applies to the discussion, you’re further betraying your ignorance.

i think you could learn from these. have fun.

http://en.wikipedia.org/wiki/Causality
http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation
http://en.wikipedia.org/wiki/Questionable_cause

by thedoctor on Apr 8, 2010 8:54 PM MDT up reply actions  

I feel like beating people over the head with correlation vs. causation lectures

You opened with this and failed to explain it in the following 20 posts. You keep making unsupported assertions and still haven’t explained how Corsi is either correlated or not correlated to outscoring or causing or not causing outscoring.

Explain that one thing, supported with an argument and some explanation as to what you’re talking about – NOT random wiki links – and Gabe and Scott might take you seriously. Until then, and this is going to read much more harshly that I mean it to – you’re essentially on ground floor thinking here, asking people to prove what’s already been proved out in volumes of posts at Behind The Net Hockey, www.behindthenethockey.com Irreverent Oil Fanshttp://vhockey.blogspot.com/ Objective NHL http://objectivenhl.blogspot.com/ MC79Hockey http://www.mc79hockey.com/ and here.

Take the offseason, do some reading, understand what’s being discussed and stop by next year.

Editor of The Copper & Blue, and leader of The Cult Of Hartikainen.

by Derek Zona on Apr 8, 2010 9:58 PM MDT up reply actions   1 recs

Do you know who else used statistics? Hitler.

by Benjamin Massey on Apr 8, 2010 11:16 PM MDT up reply actions   1 recs

yeah, but you’ve got correlation and causation mixed up. the lurking variable is “having a mustache”, which causes both “being evil” and “using statistics”.

by Passive Voice on Apr 9, 2010 3:38 AM MDT up reply actions  

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