The Celtics came into last night's game against the Cavaliers as the poorest field goal shooting team in the NBA at 41.3 percent, but coach Jim O'Brien sees lies in that number.

He acknowledged the need for the club to get a better eye, but he's using a different math to compute the shooting effect.

``If you just look at the field goal percentage, you're not looking at the same thing I happen to look at,'' O'Brien said after the Celtics beat the Cavaliers, 104-98, at the FleetCenter. ``The fact that we lead the NBA in 3s means that we're going to shoot a lower percentage. But there's an equation that coaches use.