Over the years, the growth of statistical analysis in fantasy football has been incredible to watch with numerous web sites digging into some pretty in-depth metrics to use when analyzing the performance of both NFL teams and their players. However, as we have routinely pointed out, there are many pitfalls when looking at year-to-year numbers. Things change at a rapid rate in the NFL. Not only is player movement abundant, but the revolving doors we’ve seen for head coaches and their coordinators seem to be in a perpetual spin.

As a result, comparing performances between the different seasons can often be an exercise in futility. A running back who found success against a particular team one year cannot be guaranteed success the...