You are going back to 2011? That is real helpful.
....
I just gave the raw data. It's up to you (and others) to interpret it. I think it is certainly more relevant than the data you gave. The data you gave was "our average margin of victory over the last 9 games at home is like 40". As Delete Pending pointed out, your data was wrong, and the actual number for the last 9 games is 32. What he didn't mention is that if you go back to 10 games, 11 games, or 12 games, the "average margin of victory" keeps going down, because 10, 11, and 12 were all losses. Thus, starting at "9 games" is a pretty arbitrary point, isn't it?
Even then, if you accept your arbitrary point in the middle of 2102 as the starting point, and move to the actual data, you find that your 9 game dataset includes wins against FCS Rhode Island, FCS Gardner-Webb, a Miami team that ended up 0-12, a Southern Miss team that finished 1-11, and a UAB team that finished 2-10, so more than half of your 9 games were against horrible teams. By specifically including these in your comparison example from which you are projecting the score for Ohio-Marshall, you are implicitly saying that you think Ohio is no better than these teams. I think you are wrong, but everyone is entitled to their own opinion.
Lol. Everyone has bad teams etc they play at home. It all evens out and is a level playing field. Skew the numbers if you wish but Marshall has a .86 winning pct at home and thats the best in college football.
Of course everyone has bad teams they play at home. What does that have to do with the point we are talking about? The question is, if you want to project how Marshall might do against Ohio from past games, which is more "skewed", using as a comparison point games against Rhode Island and Gardner-Webb, or using as a comparison point only games against other bowl eligible teams?
By the way, if you asked the same question about Ohio, here are the home games Ohio has had against bowl-eligible teams in the same time period:
2013 CMU 23-26 loss
2013 Marshall 34-31 win
2013 NTSU 27-21 win
2012 Bowling Green 14-26 loss
2011 Marshall 44-7 win
2011 Ball State 20-23 loss
2011 Temple 35-31 win
Ohio is 4-7, not significantly different from Marshall. I think that's pretty normal. The idea is that at home you want to win a little better than half of the games against good competition, and all the games against bad competition.