Personnel Stats

A team's personnel can be measured across 5 different categories:

  1. Height: total height of a team weighted by minutes played

  2. Bench Minutes: the number of minutes a team's bench plays

  3. Continuity: minutes played season-to-season

  4. Experience: year in school weighted by minutes played

  5. Defensive Fingerprint: identifies the style of a team's defense

Assumptions are made for each of these components, and detailed explanations are below.

Height

KenPom calls height is the most talked about physical trait in basketball. You can't teach it, right?

It does have a slight correlation to a team's offensive and defensive efficiency. And it makes sense, a taller team might defend well and score at ease in the paint versus a shorter team. But it's not the only metric that matters.

Average Height

This is measured by gathering the average listed height of every player on a team, weighted by the minutes played.

It excludes players that play less than 10% of their team's minutes.

UCF led the country in average height at 79.4 inches in the 2016-2017 season.

The shortest player featured in over 10% of the team's minutes was 6'0 or 70 inches. Its center (Tacko Fall) played in 65% of its team minutes, and was 7'6 or 90 inches.

Positional Height

This can also be broken down into positional height, meaning by each of the 5 positions on the court.

It takes the minutes played for each team ordered by height. For example, 20% of minutes played by the tallest players are likely the center's minutes.

For example, UCF's average height at the center position was +6 inches taller than the average of all teams.

UCF's starting center was 7'6 or 90 inches, and their backup center was 6'9 or 81 inches.

Effective Height

Effective height is the average of the center and power forward position. The same UCF squad posted an effective height of 3.9 inches for these 2 positions.

Bench Minutes

Bench minutes, defined by KenPom, makes an assumption that the starters of a team are the 5 players that have played the most minutes on the year.

The remaining minutes are assumed to be the bench minutes. If a player has played less than 10% of their team's minutes, the player is excluded in the bench minutes.

Michigan State's bench played in 45% of its minutes in the 2016-2017. That ranked 1st in the country. In 3 of its 5 positions, players shared a large percentage of minutes played.

In contrast, Notre Dame's bench played in only 22.2% of its minutes. That's 341st amongst all Division-I teams.

Whether a team relies on its bench is more of an attribute than a driving factor of its success. It can certainly be a factor if there is foul trouble, injuries, or a stretch of several games played in a short period.

Continuity

Continuity is the percentage of a team’s minutes that are played by the same player or players from last season to this season.

It answers more than are the same players playing this season?

It uses a percentage of a players minutes played because of injuries and a player's increased or decreased minutes season to season.

KenPom takes each player on the current roster, uses the minimum minutes (on a percentage basis) he played comparing this season and last season, and then takes the sum for all players.

Let's use the 2016-16 North Carolina team as an example. Below are the minutes from the 2014-2015 season to the 2015-2016 team. The far column includes the minimum value.

Player  |   %Min 14-15  | %Min 15-16  | Min
--------+---------------+-------------+-----+
Paige   |   16.50       |   13.43     | 13.43
Johnson |   12.20       |   14.0      | 12.2
Jackson |   13.30       |   14.1      | 13.3
Hicks   |    7.35       |   9.00      | 7.35
Meeks   |   11.20       |   8.48      | 8.48
Berry   |    5.20       |   15.4      | 5.20
Pinson  |    3.92       |   9.33      | 3.92
Britt   |    7.60       |   7.50      | 7.50
James   |    4.99       |   3.61      | 3.61
Maye    |    0.00       |   2.22      | 0.00
Williams|    0.00       |   1.52      | 0.00
White   |    0.30       |   0.40      | 0.30
Coleman |    0.24       |   0.21      | 0.21
Coker   |    0.00       |   0.20      | 0.00
Dalton  |    0.03       |   0.20      | 0.03
Egbuna  |    0.00       |   0.24      | 0.00
--------+---------------+-------------+-----+

The sum of the last column is 75.7. North Carolina players played around 76% of the minutes from 2014-2015 to 2015-2016 season. That was good for 12th amongst all Division-I teams in the 2015-16 season.

Continuity is a new, and fascinating, stat. It tells more of a story, and as Kenpom describes teams with better continuity, tend to perform better too.

In a landscape where the best teams often feature players headed to the NBA after one year, continuity is a fun metric to follow.

For example, below is Kentucky's continuity over the last 5 seasons:

Year    |   Continuity  | Division-I Rank |
--------+---------------+----------------+
16-17   |   30.2        |   322
15-16   |   22.0        |   335
14-15   |   49.6        |   176
13-14   |   23.6        |   336
12-13   |    5.9        |   334
--------+---------------+----------------+

Kentucky continuity is often low, but it doesn't mean they're not winning games.

Experience

Experience is another storytelling stat. KenPom makes the assumption that a player's eligibility class determines their experience.

Under this assumption, the following class has these levels of experience:

Year       | Experience |
-----------+------------+
Freshmen   |   0        |
Sophomore  |   1        |
Junior     |   2        |
Senior     |   3        |
-----------+------------+

Experience uses minutes played similar to the average height calculation. Players that play in less than 10% of their team's minutes are excluded.

In the 2016-2017 season, North Carolina Central led the country in 2.91 years of experience. This squad featured 7 seniors and 3 juniors.

For a comparison, Kentucky ranked 340th in the country with 0.96 years of experience.

Defensive Fingerprint

Does a team play man-to-man? Zone? Both?

The answer can be found in a team's defensive fingerprint. Kenpom uses a variety of stats to breakdown teams into 4 defensive categories:

  1. Mostly man: team plays mostly man-to-man defense

  2. Inconclusive: can't identify a specific defensive tendency

  3. Some zone: team is in zone defense for a good amount of its defensive possessions

  4. Mostly zone: team plays most its defensive possessions in a zone defense

KenPom describes defensive fingerprint as raw. It uses assist percentage, 3-point attempt percentage, free throw attempt percentage, turnover percentage, and defensive rebounding percentage.

It weights these stats to develop a profile, and place a team in a certain fingerprint category. For example, zone teams tend to have higher a defensive assist percentage and 3-point attempt percentage.

Syracuse is known for its 2-3 zone. It statistically is near the bottom of all teams in defensive assist percentage and 3-point attempt percentage.

In the 2016-2017 season, Syracuse ranked 351th in defensive A% at 67.2 and 328th in defensive 3PA% at a 42.8% clip.

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