A limitation of do_OE is that it doesn't rely on the quantity
of the player's offense production, that's to say, whether the player
provides a lot of offense or not. In addition, it does not give credit
for free-throws. An extension of do_OE has been defined:
the Efficient Points Scored (EPS), which is the result of the product of
OE and points scored. Points scored counts free-throws, two-point and
three-point field goals. A factor F is also added to put the adjusted
total points on a points scored scale. With the factor F, the sum of the
EPS scores for all players in a given season is equal to the sum of the
league total points scored in that season.