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I’ve been doing a little bit of research into NFL handicapping and I thought of comparing the scoring of first and second halves. The reason is to further understand the sport and also to see if there are any weaknesses in these lesser bet lines that I can exploit.  I went back over the last 7,023 NFL games and here is what I found to be the average scores by quarter.

NFL Average Score By Quarter & Half

Home Score
Visitor Score
1st Quarter
4.7
3.7
2nd Quarter
7.0
6.0
3rd Quarter
4.6
4.3
4th Quarter
6.2
5.7

That means the scoring by half broke down like this:

Home Score
Visitor Score
1st Half
11.7
9.7
2nd Half
10.8
10.0

I then was curious as to if those numbers had changed over time, so I went back to the 2001, 2006, and 2010 seasons to find more data:

Since 2001 

Home Score
Visitor Score
1st Quarter
4.8
3.9
2nd Quarter
7.1
6.2
3rd Quarter
4.8
4.4
4th Quarter
6.3
5.9

 

Home Score
Visitor Score
1st Half
11.9
10.1
2nd Half
11.1
10.3

Since 2006 

Home Score
Visitor Score
1st Quarter
5.0
3.9
2nd Quarter
7.1
6.4
3rd Quarter
4.9
4.5
4th Quarter
6.4
6.1

 

Home Score
Visitor Score
1st Half
12.1
10.3
2nd Half
11.3
10.6

Since 2010 

Home Score
Visitor Score
1st Quarter
5.0
4.0
2nd Quarter
7.2
6.4
3rd Quarter
5.1
4.6
4th Quarter
6.6
6.2

 

Home Score
Visitor Score
1st Half
12.2
10.4
2nd Half
11.7
10.8

 

First Half Lines

My original assumption was that the first half lines should be approximately half of the line for the full game, but it appears from the data that home teams win by nearly two points per game in the first half and only one point in the second.  Thus, the NFL lines should be higher than more than simply half the odds for the entire game. In fact, it should be closer to 2/3rds the odds for the entire game.

Quarters

Both the first and the second quarters are nearly a full point advantage!  I originally assumed it would be close to 25% advantage to the winning team in each quarter, but that does not appear to be the case.

Betting on who is going to win the first quarter is something I almost feel uncomfortable with unless I know who is going to get the ball first. It just seems to me that with such a short 15 minute time frame that whoever receives is going to have a significant advantage.  However, I might have to reconsider that strategy from this point forward and start looking at first quarter lines.

Totals

There are more points scored in the first half on average than the second.  This really shouldn’t come as any surprise.  If a team is ahead in the fourth quarter they are going to kill the clock, whereas in the second quarter they are going to keep trying to put points on the board.  There should be about a point extra given to the first half total compared to the second half total.

However, it appears that over the last two seasons this tendency has evened out.  I’m not sure if that’s due to the league going towards more pass heavy offenses, or if it’s just a smaller sample size.