See if you can figure out what this math equation is getting at: D{ijk}= μ + ai + bj + (ab){ij} + τk(i) + ε{ijk}. To be honest, it’s mostly Greek to us. Its meaning is well-understood by the statisticians involved in the latest investigation by attorney Ted Wells and the NFL. It’s the model they used to measure the pressure drop of 11 footballs put into play by the New England Patriots during the AFC Championship game against the Indianapolis Colts this past NFL season.