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| What
are OER and DER and what do they mean? |
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| OER stands
for Offensive Efficiency Rating. DER
stands for Defensive Efficiency Rating.
This is a system |
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| whereby a
basketball team's "efficiency" can be statistically rated. Simply put, OER is the number of points |
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| per
possession for any given team. The
result of every possession is recorded play-by-play. If a team turns the |
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| ball over,
"plus zero" is recorded. If
a team shoots and does not score before the other team gains possession, |
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| "plus
zero" is recorded. A team scoring
a field goal is given a "plus two" for the possession. If fouled and a free throw |
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| is made
before the other team gains possession, three points is recorded. Although somewhat rare, it would be |
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| possible
for a team to score four (or even more) points on any given possession. For example, a three point shot |
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| could be
made and the player who made it was fouled in the act of shooting. The free throw attempt was missed |
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| and
the offensive team rebounded and scored on a power shot, resulting in a five
point possession. At the end of |
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| each
half (or even each ten possessions), the number of points scored is divided
by the number of possessions, |
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| giving a
points per possession number. The
opponent's OER is referred to as the home team's DER. |
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| Over my 37
years of coaching experience, the following scale can be referred to with
some degree of accuracy |
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| as an
indication of the probability of winning/losing with any given OER or DER. |
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| OER |
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| Below
.700 |
rarely win |
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| .701-.800 |
win approx 10% of the
time, lose approx 90% |
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| .801-.900 |
win
approx 20% |
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| .901-1.00 |
win approx 40-50% |
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| 1.01-1.10 |
win
approx 65% |
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| 1.11-1.20 |
win approx 80% |
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[current season oer's
and der's] |
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| 1.21-1.30 |
win approx 90% |
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| 1.31+ |
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rarely lose |
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| DER |
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| Below
.700 |
rarely lose |
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| .701-800 |
win approx 90%, lose
approx 10% |
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| .801-900 |
win approx 80% |
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| .901-1.00 |
win approx 40-50% |
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| 1.01-1.10 |
win approx 35% |
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| 1.11-1.20 |
win approx 20% |
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| 1.21-1.30 |
win approx 10% |
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| 1.31+ |
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rarely win |
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