In the fantasy roundtable, the point was made that 50% of Laurence Mauroney's carries have been ineffective (i.e. negative or no yards) while only a third of Corey Dillon's carries had been effective. These stats illustrate how Mauroney owners are more dependent on him breaking off big runs in order to maintain his nice YPC (which is higher than DIllon's I believe). You see this argument made all the time here i.e. "RB X wouldn't be good if you take away 1-2 long runs in a given game" but I imagine this is true for a lot of running backs. Has there been any analysis of each RB's percentage of "effective runs?" What's the league average? THis information would help illustrate to what extent a Laurence Mauroney is truly a "boom or bust" guy and how different he is from other backs.