A hypothetical OL efficiency rating
Since
the offensive line is arguably the most important positional unit on a team, a
way of measuring its performance efficiency is needed. (Photo: golfing in
Lanai, 1987, Lodge at Koele).
Otherwise, as they say, the
quarterback gets too much credit for winning and too much blame for losing.
Case in point
For instance, UW quarterback
Keith Price's passing efficiency took a
nose dive in 2012 compared to his
efficiency rating in 2011, falling to 122.42 (80th in FBS in 2012) from 161.93
(7th in FBS in 2011). He was all too ready to shoulder much of the blame for the Huskies'
losses last season.
Due to injuries and
inexperience on the OL, Price played behind 6 different versions of the OL in
2012.
This year's offensive line was
much more stable; as a consequence, Price's PE was 153.3, second best in
the conference. Of the 65 possible starts in 2013, UW's five regular offensive
linemen combined for 62 starts.
Also, UW running back Bishop
Sankey rushed
the ball better than the year before, when he averaged 110.7 yards per game.
"It’s a great honor,” Sankey was quoted as saying,
this
in response to his recordsetting season.
“I couldn’t have done it without my coaches this year, and also my linemen:
Micah (Hatchie), Dexter (Charles), (Mike) Criste, Ben Riva, (Colin) Tanigawa.
All those guys, I couldn’t have done it without them."
Sankey averaged 143.8 yards per game (5.7 yards
per carry; 327 carries), finishing second best in the Pac12.
Computing a hypothetical per
game offensive line efficiency
Our hypothetical measure is a function of a
team's passing efficiency rating, its rushing yards per carry, its rushing
touchdowns and its offensive line's penalty yards. That is,
OLE = PEO + YPC * X + RT * Y  OLPY  5 * SA
Where PEO = passefficiency offense; YPC = yards per carry; x
and y = normalizing numbers; RT = rushing touchdowns; OLPY = offensive line penalty yards;
SA = Sacks Allowed
For example, in UW's 2013 game against UCLA,
which UW lost 4131, the Bruins dominated the offensive line of scrimmage,
223.52 to 135.24, i.e.,
UW Offensive line efficiency = 146.55 + 2.8*20.57
+ 1*5.09  54  5 * 4 = 135.24
UCLA Offensive line efficiency = 156.77 +
4.2*20.57 + 4*5.09  30  5 * 2 = 223.52
(*) The normalizing numbers X=20.57 and Y=5.09
were chosen so that YPC plus RT would be
equivalent to a Passing Efficiency Rating of 100. X and Y are the averages for
the Pac12 stats involving YPC (X = 90/4.375) and RT (Y = 10/1.96) for the 2013
season. The numbers 90 and 10 were chosen so that YPC would have more weight in
the computation than RT; the numbers 4.375 and 1.96 are the Pac12 averages for
YPC and RT. To guard against a meaningless
rating resulting from a limited number of carries, the normalizing number x
needs to be restricted. For one, if the number of carries
is less than z then set x=1, with the value of z yet to be determined. Alternatively, the
value of the factor ypc * x could be controlled in a similar way to the limits placed on the
NFL's passer rating computation.
More specifically, the equation
for OLE is a function of 10 metrics:

Pass attempts (PA)

Pass completions (PC)

Yards passing (TY)

Number of passing
touchdowns (TD)

Number of interceptions (I)

Yards per carry (YPC; sack
yardage figures into the calculation)

Rushing touchdowns (RT)

Offensive line penalty
yards. (OLPY)

Sacks allowed (SA)

The values for x and y
(Pac12 averages for the 2013 season)
The complete equation is as
follows:
OLE =
(TY*8.4+PC*100+TD*330I*200)/PA + YPC * X + RT * Y  OLPY  5 * SA
Note that this hypothetical computation
correlates with UW's won/lost record (94) for the 2013 season, with UW
dominating the statistic in its 9 wins and losing the stat in its 4 losses.
Just a thought.
2013 OL Efficiency Ratings in
the Pac12 through all games played (computed 23% of penalty yards, i.e., 5/22).
Team 

Passing 
YPC 
Rush TD 
P Yds 

OLE 

Record 
Oregon 

164.9 
6.3 
3.23 
15.95 

300.87 

112 
Stanford 

151.8 
5 
2.14 
10.07 

255.49 

113 
Washington 

150.3 
5.1 
2.69 
16.30 

252.62 

94 
Arizona 

126.1 
5.3 
2.77 
8.36 

240.86 

85 
UCLA 

154.1 
4.5 
2.77 
16.61 

244.15 

103 
USC 

145.3 
4.5 
2.23 
13.16 

236.07 

94 
Arizona State 

139.7 
4.4 
2.57 
6.64 

236.66 

104 
Utah 

121.9 
4.1 
1.58 
10.27 

204.03 

57 
Oregon State 

146.1 
3.5 
1.15 
11.50 

212.47 

76 
Colorado 

127.8 
3.4 
0.83 
8.73 

193.26 

48 
California 

120 
3.5 
0.83 
15.36 

180.88 

111 
Washington State 

124.7 
2.9 
0.77 
10.98 

177.29 

67 
Averages 


4.375 
1.96 





90/YPC avg; 10/RT avg. 

20.57 
5.09 





