[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.