Wednesday, August 26, 2015

Best Bowl matchups

The folks over at the SBNation main site released their big college football preview.  One of the most interesting pages that they do annually is their bowl projections.  I went ahead and categorized the matchups they gave by how close the projections put the bowl game being, as well as what the spread should be.

Team 1
Opponent
Team 1Win Chance
Average Spread
Departure from Even
Michigan State
UCLA
47.40%
-1
2.60%
Western Michigan
Appalachian State
52.90%
1
2.90%
Georgia Tech
Texas
53.00%
1
3.00%
Wisconsin
Arizona State
45.40%
-2
4.60%
Michigan
Georgia
44.60%
-2
5.40%
Oklahoma
Southern California
56.00%
2
6.00%
Central Florida
Bowling Green State
56.00%
2
6.00%
Kansas State
California
56.90%
3
6.90%
Minnesota
Arkansas
41.50%
-3
8.50%
Nebraska
Texas A&M
40.80%
-3
9.20%
Utah State
Utah
40.10%
-4
9.90%
West Virginia
Missouri
39.30%
-4
10.70%
Oklahoma State
Louisiana State
38.50%
-4
11.50%
Louisville
Tennessee
38.30%
-4
11.70%
Alabama
Oregon
62.70%
4
12.70%
Texas-El Paso
New Mexico
35.80%
-5
14.20%
Boise State
Notre Dame
33.90%
-6
16.10%
Virginia Tech
Penn State
66.40%
6
16.40%
Toledo
Georgia Southern
67.00%
6
17.00%
Duke
Mississippi State
31.90%
-7
18.10%
Iowa
Arizona State
31.40%
-7
18.60%
East Carolina
Louisiana-Lafayette
69.70%
7
19.70%
Florida State
Auburn
70.40%
7
20.40%
Baylor
Mississippi
72.20%
8
22.20%
Arkansas State
San Jose State
72.90%
8
22.90%
Houston
South Carolina
25.20%
-9
24.80%
Temple
Rice
75.50%
10
25.50%
North Carolina State
Stanford
23.20%
-10
26.80%
Northern Illinois
Colorado State
77.20%
11
27.20%
Cincinnati
Western Kentucky
78.90%
11
28.90%
San Diego State
Texas State
79.40%
12
29.40%
Ohio State
Texas Christian
79.50%
11
29.50%
Pittsburgh
Memphis
81.00%
12
31.00%
Maryland
Air Force
83.60%
14
33.60%
Miami(FL)
Marshall
85.80%
15
35.80%
Middle Tennessee State
Akron
86.10%
15
36.10%
Old Dominion
Brigham Young
10.90%
-17
39.10%
North Carolina
Navy
93.20%
21
43.20%


The best matchup in their projection is a battle of old school powers in Michigan State and UCLA, while the UNC-Navy game would be one to skip.

Monday, August 24, 2015

NFL Preseason to Regular season correlation

So, there have been a few posts over on MileHighReport talking about the team's preseason performance so far.  There's been some speculation that in recent years defensive stats have been a decent indicator of regular season performance.  I wanted to test this a bit, checking to see if there was any real link between the two.

Going back to 2012, I found total yards allowed per game in pre and regular season, as well as yards per play.  The results were not encouraging.  In the following chart, we'll see Yards per game has an R^2 of just .11, an extremely basic correlation.


Yards per play is even worse, with an R^2 of just .03.

We shouldn't expect there to be any real predictive power for preseason play.  Schemes offensively and defensively are vanilla through and through, with no game planning to attack weaknesses.  You also get extreme variance with a lot of guys playing extended snaps, who will likely be selling cars in a few weeks.

Monday, August 17, 2015

College football Top 25 Projection

This summer has been busy.  I have managed however to find some time to tweak the formulas I've used to predict team strength and come up with some composite rankings.  The changes centered a lot on removing some emphasis on turnover luck (it really has a very low significance for explaining year to year variability), and redid my returning experience formula.  It should help give a much better view of a team over a season, since the formula had a new reduced standard error equal to about half of what it had been.

In season I'll be making a few tweaks to what happens for a team afflicted with injuries, which of course will as the old military adage goes, ruin this ranking at first contact.

Team Ranking
Alabama 1
Ohio State 2
Southern California 3
UCLA 4
Oregon 5
Oklahoma 6
Baylor 7
Stanford 8
Florida State 9
Notre Dame 10
Georgia 11
Texas A&M 12
Texas Christian 13
Mississippi 14
Arizona State 15
Clemson 16
Oklahoma State 17
Michigan 18
Texas 19
Missouri 20
Texas Tech 21
Michigan State 22
Florida 23
Arizona 24
Miami(FL) 25

It loves the Pac-12, which I think will continue to shine.  I do doubt though we see USC, UCLA and Oregon in the top 5 or so at the end of the year.  I'm also not nearly as high on Florida, but they could be a darkhorse with that defensive secondary.

The program also generates odds for a team to win a range of games, which I'll sort by below, going from the best chances to win at least 11 games in the regular season.


Team Ranking
Ohio State 1
Florida State 2
UCLA 3
Alabama 4
Southern California 5
Oklahoma 6
Notre Dame 7
Baylor 8
Marshall 9
Nebraska 10
Boise State 11
Penn State 12
Georgia 13
Cincinnati 14
Stanford 15
Oregon 16
Massachusetts 17
Texas Christian 18
Wisconsin 19
Michigan 20
Northern Illinois 21
Michigan State 22
Clemson 23
Texas A&M 24
Oklahoma State 25

Sunday, August 16, 2015

Yetisburg

 Sometimes you see a game at the store and the name just begs you to buy it.  That game a couple weeks ago was Yetisburg, a civil war combat game with a fantasy setting twist.  The Union and the Confederacy square off with the aid of melee combat specialist Yetis and long range artillery Mastodons.  

Each player has access to identical armies, each with infantry and cavalry (regular and elite troopers, the elite being able to withstand more damage before needing to head to the hospital), Generals, Mastodons and Yetis.  Game play is pretty straightforward.  Each player has 5 columns of troops, 3 rows deep.  The first and second rows, the front and reserve lines, are face up and can make attacks or take advantage of abilities.  The third row is the supply line, face down cards that will be used to replenish the first two rows when when those cards are killed in combat.  Player's take turns attacking by playing a card from their hand, and ordering all troops of that card type to attack.  Results of the attack are created randomly, by drawing a meat token and flipping it over to see what direction the shot went, and what the range of the shot is.  Damage is dealt by counting the number of rows in the direction listed, according to the units ability. Regular troops all deal one damage while yetis and mastodons deal damage equal to the range. Killed troops are sent to the discard pile, and lines are replenished.  This goes back and forth until both players have either exhausted all their troops or both players pass their turn to attack. After that, players can use their Generals in the field to refresh troops for the next turn, swap positions, or bring troops back from the discard pile into the fight. The game continues on until someone cannot reinforce their lines from the supply line, or when drawing cards for their hand cant draw anymore.  

 Yeti combat is a little different from regular troops. They move to a row in between the players front lines called the trench.  Yetis crash through their own lines, killing friendly troops to get into the trench, and if their is an opposing Yeti in the trench for their column, they will knock them back to the opponents front lien, killing any troops that are there.  If a Yeti gets hit by friendly fire, they swap sides, going under control of your opponent until they get hit again.  Yetis only deal damage to the units directly next to them.
My game group has played this game now a few times and has come to a pretty much unanimous consensus: The game is a a fun, quickly paced short game, but the randomness doesn't leave you really wanting to play it again and again.  The combat mechanic makes it extremely likely you're going to on more than one occasion shoot your own troops, especially those at the left and right of them.  If there was a way to somehow get a little more strategic control of how units were shooting the game would be a bit better for replay value, especially since the artwork on the cards is so fantastic.