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Saturday, April 19, 2008When do stats become meaningful?Posted by Derek Carty at 11:01pmPizza Cutter over at Most Valuable Network's Statistically Speaking penned two articles this off-season regarding small sample sizes and when statistics start to become meanigful. Hat tip to Brock for Broglio for pointing this out. What Pizza Cutter does is find out at which point the r-squared for different statistics reaches the .50 barrier, the point at which the majority of the variation of a stat is predictable. The articles are long, but I definitely recommend taking the time to read them. Here is the article about hitters, and here is the article about pitchers. Here is a list of the stats that have fantasy baseball implications, although by reading the articles you can get a better feeling for what this all means and just how stable these stats are at the given number of plate appearances/batters faced. HittersStrikeout rate/Contact rate*: 150 PA LD%: 150 PA Walk rate: 200 PA GB%: 200 PA GB/FB: 200 PA FB%: 250 PA Home run rate: 300 PA HR/FB: 300 PA BABIP: Doesn't reach a 0.50 r-squared at 650 or below. Batting average: Doesn't reach a 0.50 r-squared at 650 or below. Pizza Cutter guesses it would at around 1000 PA. *Note: Pizza Cutter also lists a stat called "contact rate," which stabilizes at 100 PA, but this is different than the contact rate that we use. I believe this refers to contact rate on a per-pitch basis as opposed to a per-at-bat basis. PitchersK/PA: 150 BF GB%: 150 BF LD%: 150 BF FB%: 200 BF GB/FB: 200 BF K/BB: 500 BF IF FB%: 500 BF BB/PA: 550 BF BABIP: Doesn't reach a 0.50 r-squared at 650 or below. HR/FB: Doesn't reach a 0.50 r-squared at 650 or below. Concluding thoughtsI think this should help put early season stats into perspective. No batter has reached even 150 plate appearances yet, and no pitcher has faced 150 batters yet. So please relax, take a deep breath, and realize that even though April is 3/4 over, sample sizes are still too small to start making decisions based off of them. Derek Carty is a 22-year old fantasy baseball analyst residing in New Jersey. In addition to writing for THTF, his work has appeared at Rotoworld (NBC), Sports Illustrated, FOX Sports, and Heater Magazine. In his two years competing in expert leagues, he has won 2 titles with 4 four top three finishes, including a LABR NL title in 2009, making him the youngest person to ever win a major expert league title. Derek is a proud graduate of the MLB Scouting Bureau's Scout Development Program and is a firm believer in the importance of combining stats and scouting. He welcomes questions via e-mail. Commenting is not available in this weblog entry. Next Post: Waiver Wire: American League (Week 3)>> <<Previous Post: Erik Bedard - Windup Worries |
