But Statman... tell us about the stats or RBs that had 370+ carries the previous season, and how they did the following.
I'm impressed with the fact that you used 370 carries or more as the data pool rather than what most TV analysts have been doing. Many of them are far too proud of the C- they got in "Math for Journalism Majors". They typically use only those RB's that had a season in which they exceeded Murray's carries, 7 in total. There are numerous reasons for this information to be meaningless.
You cannot compare production to a group in which that person is not included. All I have to do to invalidate any claim is to declare that Murray is not in the group of "RB's that have exceeded Murray's number of carries in a season". You place the number you wish to test as the median, or middle value of the group.
Since the record number of carries of 416 is 24 runs more than Murray's 392, we can say that the highest number of carries is "within" 24 of 392. Since 368 carries is exactly 24 less than 392, it is most appropriate to say that 368 is also "within" 24 of 392. In fact, any RB with 368 or more carries are "within" 22 carries of 392.
I'm not in agreement that checking their numbers the following season is quite as fair. The real question with DeMarco Murray was whether he was going to be worth the value of his next contract, is this not so? Wouldn't it be more appropriate to measure the productivity of each player following their record carries by using the results of the next 3 years?
In any case, here are the results that you requested:
Player Year Age* Tm Att Yds TD
Barry Foster 1992 24 PIT 390 1690 11
Christian Okoye 1989 28 KAN 370 1480 12
Curtis Martin* 1995 22 NWE 368 1487 14
Curtis Martin* 1998 25 NYJ 369 1287 8
Curtis Martin* 2004 31 NYJ 371 1697 12
DeMarco Murray 2014 26 DAL 392 1845 13
Earl Campbell* 1979 24 HOU 368 1697 19
Earl Campbell* 1980 25 HOU 373 1934 13
Eddie George 2000 27 TEN 403 1509 14
Edgerrin James 1999 21 IND 369 1553 13
Edgerrin James 2000 22 IND 387 1709 13
Emmitt Smith* 1992 23 DAL 373 1713 18
Emmitt Smith* 1994 25 DAL 368 1484 21
Emmitt Smith* 1995 26 DAL 377 1773 25
Eric Dickerson* 1983 23 RAM 390 1808 18
Eric Dickerson* 1984 24 RAM 379 2105 14
Eric Dickerson* 1986 26 RAM 404 1821 11
Eric Dickerson* 1988 28 IND 388 1659 14
George Rogers 1981 23 NOR 378 1674 13
Gerald Riggs 1985 25 ATL 397 1719 10
Jamal Anderson 1998 26 ATL 410 1846 14
Jamal Lewis 2003 24 BAL 387 2066 14
James Wilder 1984 26 TAM 407 1544 13
Jerome Bettis* 1997 25 PIT 375 1665 7
John Riggins* 1983 34 WAS 375 1347 24
LaDainian Toml 2002 23 SDG 372 1683 14
Larry Johnson 2006 27 KAN 416 1789 17
Marcus Allen* 1985 25 RAI 380 1759 11
Michael Turner 2008 26 ATL 376 1699 17
Ricky Williams 2002 25 MIA 383 1853 16
Ricky Williams 2003 26 MIA 392 1372 9
Shaun Alexan 2005 28 SEA 370 1880 27
Terrell Davis 1997 25 DEN 369 1750 15
Terrell Davis 1998 26 DEN 392 2008 21
Walter Payton* 1979 25 CHI 369 1610 14
Walter Payton* 1984 30 CHI 381 1684 11
You basically have a list of the greatest RB's in the history of the NFL.
45.9% of these seasons were produced by eventual Hall of Famers.
54.0% of these seasons were produced by someone who did it more than once. It's difficult to say that a player has a high probability of declining when more than half of these seasons either get repeated or are already repeats.
The average age is 25.5. The average point in their career is 4.5 seasons. Interesting since they average a career span of 10.5 seasons, meaning the season occurred around the midpoint of their career. So much for the myth that a season such as this will destroy an RB's career.
The youngest RB was 21 (Edgerin James), the oldest 34 (John Riggins).
The average number of thousand yard seasons over the following 3 seasons is 1.5. The average number over their remaining career is 2.7.
On the average, a RB that has had a season in which his carries are 368 or more will have almost 3 more years of thousand yard seasons.
26.1% had 3 consecutive thousand yards seasons immediately following.
47.8 has 2 thousand yard seasons in 3.
78.2% had at least 1.
This data by no means guarantees that DeMarco Murray would continue on his record breaking pace. However, it slams the door shut on any perception that DeMarco was in any way a high percentage risk. This, of course, is just one of many myths about DeMarco Murray. I suppose many of them were so quickly accepted as a means of justification for the actions of the Cowboy management.
Is DeMarco Murray an elite RB? I'll put it to you this way:
He starts the season out by breaking a 50 year old record of an historically elite RB like Jim Brown. He ends the season by breaking the single season record of the guy who is the historical leader in NFL history, Emmitt Smith.
When you are breaking the records of some of the most elite RB's in history, doesn't that pretty much make you an elite RB?
Other items to ponder:
DeMarco Murray is the first Cowboy RB since Emmitt Smith at the turn of the century to record back to back thousand yard seasons.
The Cowboys have recorded a thousand yard rusher 25 times in 55 seasons. DeMarco Murray is only the 4th RB in Cowboy history to record multiple thousand yard seasons.
DeMarco's 2013 thousand yard season was the 2nd highest in Cowboy history for average yards per carry of 5.17. That was the season before our elite O-line given the most credit for this past season. Emmitt's 1993 Super Bowl season was ranked #1 at 5.25 yards per carry. You remember don't you? The year he sat out the first two games which the Cowboy's lost?
The guy responsible for that decision was the same guy that is assuring you the running game will be better this year. You may want to adjust his credibility.
Last season DeMarco also broke the Cowboys single season mark for total yards from scrimmage which was 2261, that's 13 more yards than Emmitt Smith's 1995 Super Bowl season.
DeMarco Murray is ranked 3rd in Cowboy history for RB's first four seasons of rushing yards. The two top guys are in the Hall of Fame.
If you wish to debate my opinions that is certainly your right. However, 90% of what I have just posted are statistical facts unless I have made a mathematical error in my calculations. Feel free to check.