In the last post, I began constructing a passer rating system that, to the greatest degree possible, includes performance variables controlled by the quarterback alone and avoids redundant use of variables that measure the same attribute.
The new system includes completion percentage, interception rate, and sack yards per attempt. The previous post discussed completion percentage, and this one will cover interception rate. Each QB's stats are computed in terms of how many wins they add, on average, to his team over the course of a season.
While most fans and analysts consider how many inteptions a QB has thrown, they ignore the fact that various QBs have a wide range of passing attempts, even among QBs with the same number of games played. Interceptions per pass attempt is a better indicator of a QB's true tendency to throw interceptions.
The table below ranks QB's interception rates in 2006. Only QBs with over 100 pass attempts are included. Theh column labled "Int Rate > Avg" is the amount above (or below) the average NFL interception rate. Negative numbers are better here because they mean fewer interceptions per attempt. The column labled "Int Rate Wins" are the wins added (or lost) due to the interception rate of the listed QB. Postive numbers are (obviously) better here. The added wins are computed by the efficiency win model Ipreviously established.
|Player||Int Rate||Int Rate >|
|Int Rate Wins|
In the next post, I'll look at sacks. Then finally, I'll pull it all together for a comprehensive QB win-rating.