[Formulawiz]

In the NFL I came across this writeup and I was wondering if someone can explain and give an example as how to calculate both of these stats using the boxscore of any game last week.

NPP% – Negative Pass Plays, expressed as a percentage. This is how often an opponent's pass plays end in either a sack or interception. Defenses that get after the quarterback and overwhelm the opposing offensive line naturally force sacks and INTs. These negative pass plays are calculated as a percentage of attempts. So if a team foces two sacks and two INTs in 40 pass plays, their NPP% will be 10 percent (4/40).

3down% - Opposition success rate on third down. The lower the percentage, the higher the defensive success.

[runnershane14]

used for example: covers.com/pageLoader/pageLoader.aspx?page=/data/nfl/results/2009-2010/boxscore26616.html&t=0

Colts: 2 INTs + 1 sack/ 35 pass attempts = 8.57% = NPP%
Bills: 0 INTs + 0 sacks/ 25 pass attempts = 0.00% = NPP%

3down%
http://espn.go.com/nfl/boxscore?gameId=300103002

Colts: 3/11 3rd downs on offense
Bills: 5/14 3rd downs on offense

[runnershane14]

could have just used the espn box score, I just started with the covers link when I started looking at it

[Busterflywheel]

Interesting