Tables of Stats
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I do what to say this, I have no idea on what your definition of the word "around" your goalie game example range from 3 games all the way to the 20s. You want me yo look at around the same the save Percentage. You have anywhere from 908 all the way to 932 save percentages as your example. So 17% apart from Demko. So Demko had a 915 save percentage so I can use anywhere from 898 to 932 I guess which most goalies have that save percentage.
These are my examples that I came up with. A few games to about 20 games 1st vs 2nd years and these are the goalies that have their numbers improve. Allen, Elliot, MAF, Bernier, Quick,Gross, Dubynk, Halak, Schneider, Rask, Crawford, Bishop, Howard. Your original argument almost all sophomore go through a slump is 100% not accurate
Yes I did say age matters but I think if we are talking about elite young player svs ok young players. I don't think it matter much considering the fact Hughes as 19 year old already had a better college season than a 22 year old Stecher.
There are no evidences that indicates more rookies have second year slump vs getting better. It is not a higher chance Petey won't improve in his second year.
Also btw some of your goalies examples you comparing a few games from year 1 to year 2. I dont think the Data that you are working with, won't be close to accurate. The sample size is too small.
My goalie data is picked from goalies who played between 5 and 15 games, around Demko's sample size, and from .905 Sv% and up to avoid accusations that I picked worse goalies to compare him to. I studied only the past 10 seasons as going back too far provides data that doesn't fit as well. For goalies that played less than 5 games in their official rookie seasons, I chose their next season and the season after that using the Calder definition of a rookie.
Obviously, we're talking low sample sizes and high signal to noise, but that's the case with pretty much every hockey stat. Even using three-year averages from our main roster you're at a sample size of ~246 games plus or minus injuries and the odd season where a midseason trade has a player playing 83 or 84 games. Those sample sizes are still small compared to baseball, and hockey has more moving parts than games like football or basketball.
Looking at the idea of a sophomore slump, let's widen our net and look at rookies from the 20005 - 2006 seasom onward who scored at or above a 0.75 PPG rate in at least 40 games and see what their next season held. My previous data was 10 years and looked only at forwards, this may let an exceptional defenseman through. I won't post all the stats here, I'll just post the number of increased, decreased, and stay with a point either way.
http://www.nhl.com/stats/player?rep...ter=pointsPerGame,gte,0.75&sort=pointsPerGame
Up: 10 of 30
Down: 15 of 30
Same: 5 of 30
So half of these highly skilled players dropped off, 2/3rds of them dropped off or failed to improve, and 1/3rd of them showed some level of improvement. These are some of the most skilled players in the NHL and they couldn't consistently improve in their sophomore seasons. I think that is fairly conclusive that the idea of a sophomore slump is real even among the most skilled players.
I'd imagine the trend would hold among all rookies, but I really don't want to code a script to automate that and doing it manually would be a chore. Be my guest on that one if you think it will prove anything.
As for Hughes vs Stetcher, I think age and physical maturity matter more at the NHL level than they do at the college level. We've seen this time and time again as players move from the junior, college, and European ranks into the AHL and NHL. Skill only gets you so far when you're lacking in strength, experience, and explosiveness which all come with age and physical maturity. That's not to say Hughes can't go off and score a ton of points, just that I'm not comfortable making such a prediction.