Each individual rush is considered on it's own, and measured by it's "success." A run is considered successful if it gets 40% of the yardage needed to move the chains on first down, 60% of the yardage needed on second down, and 100% of the yardage needed on third or fourth down. This is a much more accurate overall picture of how well a running back does in a game than just the total yardage or ypc averages because it ignores big run outliers that can skew those kinds of stats
Stats after the jump.
This was by far CJ's most successful game of the season, and after going back and looking at it this way, he actually had a really good game. I know we are still waiting for the 80 yard touchdown run, but if he can turn in games where his success rate is 48% the Titans are going to be successful as a team.