13.67 NFL offense.
In the National Football League (NFL), many argue that rules changes over the years are favoring offenses. Consider a time series of the average number of offensive yards in the NFL per regular season from 1990 through 2013.36
nfloff
13.67
(a) The offensive yards are increasing over time. (b) . The trend term means that the number of offensive yards increases by 1.54596 each year. (c) For 2014: 342.3953. For 2015: 343.9412. For 2016: 345.4872.