Article with charts at the bottom.
This is an old study for the years 1980 thru 1998 but more than likely it's probably still accurate. 
The linesmaker is within a field goal or less of the actual result in 21.3% of all games, just over one game in five.
He's within a touchdown of the actual spread 44.4% of the time (a bit more than two games in five).
He's within 10 points of the actual spread just under 59% of the time.
Looked at another way the linesmaker misses the mark by more than a field goal almost 80% of the time (4 games in 5).
He misses by more than a touchdown 56% of the time (almost 3 games in 5).
And he really misses the mark, by more than 10 points, 41% of the time (2 games in 5).
What does this tell you about the linesmaker and how to play the NFL? Just pick the winner of the game and you have an excellent chance of being a pointspread winner!
The accompanying charts reveal that the median difference between the line and the actual result of a game is 8.2 points. What this means is that 50% of the time the linesmaker is within 8.2 points of the actual result and 50% of the time he misses by more than that number.
And you'll note that he has been consistent in that median in that his best years were 1989 and 1991 when he was off by 7.3 points or less 50% of the time. His worst years were 1982 and 1990 when he missed the mark by 9.5 points or more 50% of the time.
of these guys. 
The all knowing Vegas Oddsmakers 
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