Offensive Rating measures how the offense of a team performs. This can be at the team level - for example, the Duke Blue Devils had a 118.4 Offensive Rating in the 2018/2019 NCAA season - or for a specific lineup, player, or situation within a team. This is accomplished by choosing a criteria (i.e. when James Harden is on the floor in the 4th Quarter or all Syracuse offensive possessions) and dividing the number of points scored by the total possessions by the offensive team. This provides a repeatable method for comparing and understand how an offense performed or, if the sample is large enough, will perform in certain situations.
OffRtg = 100 * [ (Points) / (POSS) ]
However, Offensive Rating is the surface level of offensive performance. How those points were scored can vary significantly.
Shot types, ability to draw fouls, reducing turnovers, and grabbing offensive rebounds all play significant factors in how a team generates points. As you may have noticed, those are the ever popular Four Factors and every offensive rating has a unique and easily understood signature.
For example, at this moment, Luka Garza(Iowa) and Vernon Carey(Duke) have very similar offensive ratings, both around 121.5, but when