How is quarterback rating determined
Passer rating is determined by four statistical components, each of which is computed as a number between zero and 2.375. The benchmarks for these statistics are based on historical averages. If any of the raw components are beyond the limits of zero or 2.375, the component is set to limiting value of zero or 2.375 as the case may be. * The component for completion percentage, C, is calculated as: {{COMP over ATT} times 100 – 30 over 20} * The component for yards per attempt, Y, is calculated as: left( { YDS over ATT } – 3 right) times { 1 over 4 } * The component for touchdowns per attempt, T, is calculated as: { TD over ATT }times 20 * The component for interceptions per attempt, I, is calculated as: 2.375 – left( { INT over ATT } times 25 right) The four components are then added, divided by 6, and multiplied by 100.
