Does anyone know how the NFL handles rounding of yardage in its stat-keeping? For example, if a running back picks up between 3 and 4 yards on a carry, what determines if he is credited for 3 or 4? I'm thinking it's rounded up or down to the nearest yard starting at zero.
The reason I ask is because our league credits defenses for sacks, and one week a defense had two sacks; one was for zero yards. The defense was credited with a sack even though the statistic doesn't indicate that it was behind the line of scrimmage and therefore a sack. My guess is that it was a short loss of maybe a foot or a few inches, enough to move the ball backwards but not enough to be granted a full yard.
The line of scrimmage is marked as the line closer to the goal line towards which an offense is moving. If the nose of the ball is across the 50, but before the opponent's 49, the line of scrimmage is the opponent's 49. If the ball goes backwards on a play, but doesn't reach the 50, it's a sack for no yards. Had the ball moved forward, but not reached the 49, it would be a run for no yards.