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Sabermetrics

Sabermetrics. James Parsons. Mathematics Numerical Analysis Applied Numerical Analysis Sabermetrics. Facts about Sabermetrics. Earnshaw Cook – starting researching in the middle of the 20 th century . Sabermetrics is the search for objective knowledge about baseball

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Sabermetrics

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  1. Sabermetrics James Parsons • Mathematics • Numerical Analysis • Applied Numerical Analysis • Sabermetrics

  2. Facts about Sabermetrics Earnshaw Cook – starting researching in the middle of the 20th century. Sabermetrics is the search for objective knowledge about baseball Sabermetrics comes from the acronym SABR (Society for American Baseball Research) coined by Bill James

  3. Abbreviations BB – Base on Balls HBP – Hit by Pitch SF – Sacrifice Fly H – Hits RBOE – Reach based on Error 1B – Single 2B – Double 3B – Triple HR – Home Run TB – Total Bases AB – At Bats PA – Plate appearance

  4. 3 Different Statistical Categories in Baseball Baseball Offense Defense Pitching

  5. On Base plus Slugging (OPS) • OPS = OBP + SLG • SLG = TB / AB • TB = 1B + 2(2B) + 3(3B) + 4(HR) • OBP = (H + BB + HBP) / (AB +BB + SF + HBP) • Example: 2013 Miguel Cabrera (DET) • SLG = (122 + 2(26) + 3(1) + 4(44)) / 555 = .636 • OBP = (193 + 90 + 5) / (555 + 90 + 2 + 5) = .442 • OPS = .636 + .442 = 1.078

  6. Weighted On-Base Average • The equation was developed by Tom Tango who co-wrote The Book: Playing the Percentages in Baseball • wOBA = (.72 * BB) + (.75 * HBP) + (.9 * 1B) + (.92 * RBOE) + (1.24 * 2B) + (1.56 * 3B) + (1.95 * HR) / PA • 2013 Mike Trout (LAA): • wOBA: =((.72* 110) + (.75*9) + (.9*115)+ (.92*RBOE) + (1.24 *39) + (1.56*9) + (1.95*27) ) / 716 = .425 + (.92*RBOE) • The constants are changing each year so each year the wOBA changes each year.

  7. Real Life Example • 2003 Baseball Season • Movie: Moneyball • 2003 Oakland Athletics payroll just under $50 million dollars • Record : 96-66 • 2003 New York Yankees payroll just under $170 million dollars (3.44x more) • Record: 101-61

  8. Problem with Sabermetrics • At the end of each season the statistics that were calculated are reverted back to zero. • Baseball is unpredictable. • Getting a limited amount of data points

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