In the next few posts
I will discuss some of the statistical components that translate into winning
basketball. Players who inhibit these characteristics are also
fairly available and some players who may damage teams due to their inability
to help contribute to any of the below could be overrated etc.
These are four main
factors that attribute to a winning basketball team (in order):
1. PF/C combo has good
help defense
2. High Rebound Rate
3. High Assist to
Turnover Rate
4. High 3 point
attempt rate
Now it is rare that
any team excels in all of these attributes.
Upon doing further research
some of the better (or worse teams) in the league simply excel at the first two
items and are just average on the bottom two. Let's take the Boston
Celtics for example with our first metric.
PF/C Defense
This is the hardest
metric of the four to measure simply because there's no exact stat that
specifically tells you if players are indeed good defensively or not.
There are items like block, steals, or a combination of the two (CHG aka
defensive plays include charges taken), but they still do not tell a complete
story of one's defensive prowess.
The best tool
available for such an item is plus-minus. Using basketballvalue.com we
can find these numbers for any team over the course of the season. For
defensive purposes, a telling sign is if someones Net defensive +/- (i.e. the
team's defensive rating for a certain player that is on the court vs when he is
off it) is negative. This indicates that the team allows a decreased
opponent offensive rating (points per 100 possessions) when that player is on
the floor vs. off it. Obviously the more negative this number is the more
it shows how much of an impact that player makes on the defensive end.
One of the major attributes to Boston's success (they did have
56 wins) was their front court rotation excelling in defensive net plus minus.
Now the reason I chose Boston here is simply because they were
not stellar in any of the other metrics.
Boston ranked 20th in rebounding rate, 11th in assist to
turnover rate and 27th in 3 point attempt rate.
The reason for Boston still being able to have a solid season
was indeed their PF/C front court defense (dealing Perkins did not help).
Below is a list of the net defensive +/- for Boston's PF/C
combos (sorted by minutes played):
Glen Davis: 1.52
Kevin Garnett: -6.19
Nenad Kristic: 2.85
Shaquille O'neal: .22
Kendrick Perkins: -3.72
Luke Harangody: -1.1
Semih Erden: 2.58
Jermaine O'neal: -1.57
Troy Murphy: -0.57
What we really see above is the impact KG had on the team's PF/C
defense. No other big in the team's top 4 minutes played came close to
his -6.2 net defensive plus minus.
Seeing the above it is no reason to see how the team's decline
after the Perkins for Green/Kristic deal was so glaring. The team dealt
away an over -3 net defensive plus minus for a 5 in Nenad who's number was over
+2, a whopping 5 point swing.