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Who would have guessed ND would average 6.9 wins per season? It makes sense if you think about it historically of course.

is this since the 1800's?

many seasons then didn't include 6 games

Thanks. Please continue your work. It's been sorely missed around here.

It is interesting.  It is obviously biased in favor of schools that haven't been playing very long due to the increased number of games lately.  For Ohio State:

• Averaged 13 the last two years (both 13-1)
• Averaged at least 12 since 2012 (Urban took over that year)
• Averaged at least 11 since 2001 (Tressel took over that year)
• Averaged at least 10 since 1988 (Cooper took over that year)
• Averaged at least nine since 1957 (Woody's second NC)
• Averaged at least 8.8 since 1951 (Woody took over that year)
• Averaged at least eight since 1928

An illustration of how much this has changed:
In three seasons from 1968-1970 Ohio State won an NC and missed twice by losing their last game.  Over those three seasons they averaged nine wins:

• 1968:  10-0 Big Ten, Rose Bowl, and National Champions
• 1969:  8-1 Lost to Michigan in what was guaranteed to be the Buckeyes' last game due to the conference's "no repeat" rule wrt the Rose Bowl
• 1970:  9-1 Lost to Stanford in the Rose Bowl.  
• Total 27-2
• Average 9-0.67

That is an extremely good three-year stretch but it "only" averaged nine wins because the team could only play nine or ten per year.  

By way of comparison the last three years (2017-2019) have been good, but not quite THAT good for the Buckeyes but they have averaged a LOT more wins:

• 2017:  12-2 B1G and Cotton Bowl Champions, missed CFP.  The two losses were to Oklahoma OOC and Iowa in the B1G.  The Buckeyes got an "extra" win over UW in the B1GCG.  
• 2018:  13-1 B1G and Rose Bowl Champions, missed CFP.  The loss was to Purdue in the B1G.  The Buckeyes got an "extra" win over NU in the B1GCG.  
• 2019:  13-1 B1G Champions.  The loss was in the CFP Semi-Final.  
• Total 38-4
• Average 12.67-1.33

Comparing to 1968-1970:  

• The 2017-2019 Buckeyes averaged 0.67 MORE losses per year than the 1968-1970 Buckeyes
• The 2017-2019 Buckeyes averaged 3.67 MORE wins per year than the 1968-1970 Buckeyes due to a longer regular season (12 vs 9) and the possibility of a CG and bowl EVERY year.  

. . . An illustration of how much this has changed:

In three seasons from 1968-1970 Ohio State won an NC and missed twice by losing their last game.  Over those three seasons they averaged nine wins:

• 1968:  10-0 Big Ten, Rose Bowl, and National Champions
• 1969:  8-1 Lost to Michigan in what was guaranteed to be the Buckeyes' last game due to the conference's "no repeat" rule wrt the Rose Bowl
• 1970:  9-1 Lost to Stanford in the Rose Bowl. 
• Total 27-2
• Average 9-0.67

That is an extremely good three-year stretch but it "only" averaged nine wins because the team could only play nine or ten per year. . . .

That's just when I was starting to pay attention to college football.  I didn't remember tOSU's 3-year stretch had been quite that good.  That's a hell of a run to only emerge with one national championship.
Even better than, and also reminiscent of, OU's stretch from '85 through '87.  33-3, with all three losses to Miami, including a #1 vs. #2 matchup in the '87 (season) Orange Bowl.  One natty--1985 with a win over Penn State in the Orange Bowl.

Oh, yeah?

Sooners' stretch when I was there in the first four of my five wasted years, plus my wasted senior year in HS:

54-3-1.  A loss to Nebraska in '71.  A loss to Colorado in '72.  A tie with USC in '73.  A loss to Kansas (Kansas!) in '75.

A natty and a half.  We'll say two.

Ouch!  What's the worst of all that?

I'm guessing this one: Iron Bowl record: 0-5.