ncaa basketball tournament predicting performance
Download
Skip this Video
Download Presentation
NCAA Basketball Tournament: Predicting Performance

Loading in 2 Seconds...

play fullscreen
1 / 27

NCAA Basketball Tournament: Predicting Performance - PowerPoint PPT Presentation


  • 96 Views
  • Uploaded on

NCAA Basketball Tournament: Predicting Performance. Doug Fenton, Ben Nastou, Jon Potter. Project Goals. To examine some of the factors that indicate how well a team will do in the NCAA Men’s B-Ball Tournament

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' NCAA Basketball Tournament: Predicting Performance' - rue


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
ncaa basketball tournament predicting performance

NCAA Basketball Tournament: Predicting Performance

Doug Fenton, Ben Nastou,

Jon Potter

project goals
Project Goals
  • To examine some of the factors that indicate how well a team will do in the NCAA Men’s B-Ball Tournament
  • To compare factors (such as seed, conference, and individual team) and their effect on a team’s result
  • To create an effective model for how well a team does based on certain factors
background
Background
  • The NCAA Basketball Tournament is a 64-team, single elimination tournament.
  • This has been the tournament’s format since 1985: we use data from 1985-2000.
  • There are four separate regions, each with sixteen teams seeded 1-16 (with 1 being the best and 16 being the worst).
  • The result (dependent) variable is based on how many games a team wins in the tournament.
general analysis
General Analysis
  • The first two (independent) variables looked at were the team’s seed and its winning percentage.
  • The regression was as follows:
  • Result =.599 - 0.151*seed + 2.32*percent
  • (R^2=.387) (1.87) (-18.43) (6.00)
  • As can be seen from this data, both seed and winning percentage had a large effect on the team’s result, with result being positively related to percent and negatively related to seed.
1 seed vs 2 seed
#1 Seed vs. #2 Seed

Histogram for #1 Seed

Histogram for #2 Seed

Assuming normality in the distribution of results for #1 Seeds and #2 Seeds,

T n+m-2 = (Avg(x)-Avg(y))/(SP*(sqrt(1/n+1/m)) = 3.46

T n+m-2 = 3.46 > 1.64 = T 0.05, 126

We can therefore conclude with 95% certainty

that One Seeds outperform Two Seeds.

differences in variance
Differences in Variance
  • Do #1 Seeds have a different variance from #2 Seeds?
  • H0: S12= S22 vs. H1: S12≠ S22
  • F = S12/ S22 = 2.49/2.22 = 1.12
  • Critical Value: F(63, 63) with 95% confidence:
  • .600<F<1.67
  • Therefore, the F-stat falls within the interval and #1 Seeds may have the same variance as the #2 Seeds.
seed analysis
Seed Analysis
  • With other seeds, the result data cannot be assumed to be normal.
  • Therefore, hypothesis testing comparing seeds could not be used
  • However, we were able to test if the probability of a given seed winning the championship was different than 1/16 (If all seeds were created equal).
does the top seed win the championship more often
Does the Top Seed Win the Championship More Often?
  • H0 : p1 = 1/16 vs. H1 : p1 > 1/16
  • t = (9 - 16*(1/16)) / ((16*1/16(1-1/16))^.5)

t = 8.26 > t(.05,15) = 1.74

  • Therefore, we reject the null hypothesis, which means that the top seed wins the championship more often than if the tournament was randomly seeded.
do the high seeds typically outperform the lower seeds
Do the High Seeds Typically Outperform the Lower Seeds
  • | Hi Seeds (1-8) | Lo Seeds (9-16) | Total
  • Lo Result(0-2) | 392 | 504 | 896
  • Hi Result (3-6) | 120 | 8 | 128
  • Total | 512 | 512 | 1024
  • % Hi Result | .234 | .0152
  • H0: pH = pL vs. H1: pH > pL
  • Phat = (120+8)/(512+512) = .125
  • Z = (see Thm. 9.4.1) = 10.58 > 1.64 = Z.05
  • Hence, as expected, higher seeds outperform lower seeds.
the conference variables
The Conference Variables
  • The teams from our study came from 31 different conferences.
  • These conferences were divided into 4 different tiers based past tournament performance and the number of schools who get into the tournament each year (Tier 1 being strongest conferences; Tier 4 being weakest conferences)
  • We then tested how a team’s conference tier was correlated with their performance.
comparing teams conferences
Comparing Teams’ Conferences
  • We tested the correlation between a team’s conference tier and their performance in the tournament.
  • Likewise, we tested to see if there was significance of a team’s winning percentage given their conference tier.
  • Therefore, we created a dummy variable for each tier and interaction terms between tier and winning percentage.
results r 2 40
Results (R^2 = .40)
  • result | Coef. Std. Err. t P>|t|
  • -------------+--------------------------------------------------------
  • win % | 1.219 .574 2.12 0.034
  • Tier 1 | -4.40 .543 -8.10 0.000
  • Tier 2 | -2.148 .824 -2.61 0.009
  • Tier 3 | -4.189 1.00 -4.18 0.000
  • %*T1 | 7.90 .756 10.44 0.000
  • %*T2 | 3.93 1.136 3.46 0.000
  • %*T3 | 6.20 1.34 4.61 0.000
is tournament fairly seeded based on conference tier
Is Tournament Fairly Seeded Based on Conference Tier?
  • To see if this is true, we looked at only the top 4 seeds because they seemed the most normal.
  • For each of these seeds, we created four groups, one for each tier; to see if performance was consistent with the conference tier given a team’s seed.
  • ANOVA was used for analysis of:
  • H0: MT1 = MT2 = MT3 = MT4 (for each seed 1-4)
results
Results
  • Seed Group | F. | F-critical
  • --------------------------------------------------
  • Seed 1 | 1.102 | 3.148
  • Seed 2 | 0.365 | 2.758
  • Seed 3 | 0.934 | 3.148
  • Seed 4 | 0.039 | 2.758
analyzing certain teams
Analyzing Certain Teams
  • Dummy Variables were created for teams which had been in at least 12 (75%) of the tournaments.
  • There are not enough data points, and the histograms are too skewed, to assume normality for the team data
is duke the best duke vs kentucky
Is Duke the Best? Duke vs. Kentucky

Kentucky

Duke

Assuming normality in the distribution of results for both

Kentucky and Duke (which may not be a valid assumption),

T n+m-2 = (Avg(x)-Avg(y))/(SP*(sqrt(1/n+1/m)) = 0.356

T n+m-2 = 0.356 < 0.856 = T 0.20, 26

Therefore, we cannot reject the null hypothesis that Duke and Kentucky have perform equally well with even 20% certainty

time trends
Time Trends?

According to this time trend regression, Kentucky would have overtaken Duke in 1994.

are certain teams mis seeded
Are Certain Teams Mis-Seeded?
  • If the team’s dummy variable is significant with seed, it suggests that that team is often “mis-seeded” (ie. a team is consistently seeded higher or lower than it should be).
slide22

Under-Rated?

So, for example, Duke can be expected to win more than one more game than other teams of the same seed, and Illinois can be expected to win more than half a game less than other teams of the same seed.

If Duke and Illinois are seeded the same, Duke can be expected to win almost two full games more than Illinois.

analyzing experience
Analyzing Experience
  • An experience variable was created to reflect the total number of previous tournament games (won or lost) a team had played since 1985.
  • Result = .952 + .054*experience - .051*year
  • (R^2=.14) (12.80) (12.87) (-5.51)
  • Hence, there is correlation between experience and result, suggesting that teams which have been in the tournament often typically win more games… also, successful teams typically stay successful.
regression with experience r 2 39
Regression with Experience (R^2=.39)
  • result | Coef. Std. Err. t P>|t|
  • -------------+--------------------------------------------------------
  • win % | 2.575 .391 6.59 0.000
  • seed | -.131 .009 -13.72 0.000
  • exper | .016 .0042 3.84 0.000
  • year | -0.016 .0081 -2.07 0.038
experience cont
Experience (cont…)
  • That experience is significant when regressed with seed and winning percentage indicates that it is not fully accounted for in the seeding of teams, and that it is another variable worth looking at when making tournament predictions.
  • The experience variable is significant in a variety of regressions indicating its robustness as an explanatory variable
conclusions
Conclusions
  • Tournament predictions can be fairly accurate based solely on seed
  • There are other predictors such as winning percentage, conference, and experience which can be used to refine predictions
  • However, better teams don’t always win, so it is impossible to make predictions absolutely
ad