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Which Teams Are Trending Up Or Down?

The Eagles have outscored their opponents by 17 points this year, but Philadelphia is obviously trending in the wrong direction. The Eagles began 3-0 with wins of 19, 15, and 31 points, but have now lost five games in a row.

So what if instead of using traditional points differential, what if we used a weighted version based on when the game occurred? To do this, we multiply the Eagles points differential in each game this season by the game number; that means the team’s third game counts for three times as much as the first game, and the ninth game counts for three times as much as the third game. With 14 games so far this year, to determine the team’s weighted points differential, we sum the weighted results and divide by 105 (14+13+12+11…+1).

By doing this, Philadelphia’s points differential moves from +1.21 to -3.72. Here’s how:

What if we use this methodology for every team? Well, the Falcons, who have now won back-to-back games by 28 points, jump to #1 with a +10.61 points differential. But perhaps more interestingly, it’s the Colts who have the biggest increase when moving from points differential to weighted points differential:

Unsurprisingly, the Eagles rank a very distant #32, with the Vikings and Rams rounding out the bottom three. You probably could have guessed that, which makes me think this does a pretty good job of matching our intuitions.

References

References
1 This is the sum of the numbers in this column divided by 105, which is the sum of the numbers in the column to the immediate left.
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