Team Total Bases Differential takes the number of total bases accumulated by a team's offense on a per game basis and subtracts the number of total bases allowed by the team's pitching staff.
More about Team Total Bases Differential
An average team (one with an offense that accumulates as many total bases as are allowed by the pitching staff) will have a ratio of approximately zero. In 2013 the best and worst teams had a differential of almost three in either direction. In times of greater offense the difference would often surpass three for the very best or very worst teams. In times of less offense in the early 1990's the greatest differences were closer to one-and-a-half, and occasionally approaching two.