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July 25, 2008
The Week Score (by position)
Using my game-by-game data (all games since 2001), the first statistic I set out to determine was a week-by-week comparison of how every player compared with every other player. Using total fantasy football points (using the Yahoo! rules) as an index, I was able generate a z-index (standard score). Mathematically, the stat works like this 
For every player in every game, we can loop through and generate the z-value. Our population sample used is every other game played by other players at the same position.
For example, here's the week 5 of 2007 top 5 players:
+-------------+----------+---------------+------+--------+--------+ | name | position | pop_score_pos | week | season | points | +-------------+----------+---------------+------+--------+--------+ | T. Brady | qb | 1.78 | 5 | 2007 | 27 | | P. Rivers | qb | 1.11 | 5 | 2007 | 21 | | G. Frerotte | qb | 1.11 | 5 | 2007 | 21 | | J. Campbell | qb | 1.00 | 5 | 2007 | 20 | | P. Manning | qb | 0.78 | 5 | 2007 | 18 | +-------------+----------+---------------+------+--------+--------+ 5 rows in set (0.05 sec)
And here's the bottom five:
+---------------+----------+---------------+------+--------+--------+ | name | position | pop_score_pos | week | season | points | +---------------+----------+---------------+------+--------+--------+ | V. Young | qb | -1.34 | 5 | 2007 | -1 | | B. Gradkowski | qb | -1.34 | 5 | 2007 | -1 | | B. Leftwich | qb | -1.34 | 5 | 2007 | -1 | | B. Volek | qb | -1.23 | 5 | 2007 | 0 | | J. Kitna | qb | -1.23 | 5 | 2007 | 0 | +---------------+----------+---------------+------+--------+--------+
This stat (which I refer to as pop_score_pos) tells me on a week-by-week basis how a player performed compared to a large population of all past games. I think this might be the most valuable when looking at how a player performs against a given team (which I'll cover in a future post)
Posted by haydenth at July 25, 2008 11:08 PM