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Regrading Pitchers

It is common practice for APBA players do institute some sort of pitching regrades as part of their replay. There are many different systems out there for doing this, but they all require a bit of legwork, a spreadsheet (hopefully), and a way to manually update the pitcher's grade in the player's database. The August 1990 APBA Journal included an article named "New Way to Make Weighted Average Pitching Grades for Master/Computer Game." This process is broken down into a step-by-step process below.
  1. The best and easiest way to get the basic pitching stats into a spreadsheet is to go to http://baseball-reference.com, search for the season you are looking for, and dump the pitching stats into a spreadsheet. This would be the time to perform any maintenance on the data (Hint: convert thirds of innings from .1's and .2's to .33's and .67's - it will make the math later much better)
  2. You will most likely want to grade the NL and AL pitchers by the league, not as a whole. The stats can be downloaded as a whole or by the league
  3. Pitching stats include stats for each player for each team he played for that season. You will likely want to grade each pitcher separately for each team
  4. The downloaded stats include many categories. The ones you will want are Name, Team, Innings, ERA, Walks, Strikeouts, and home runs, and again, broken out by the league. For the purpose of this exercise, these can be culled out into a separate spreadsheet tab for further manipulation (Lefty Gomez)
Calculate each pitchers grade:
  1. Sort the pitchers by ERA, highest-to-lowest
  2. In a separate column, sum the innings pitched (IP). The worst 6% by IP get a grade of 1. The next 6% get a grade of 2, continuing up through grade 15. Start a new column and make sure the calculated grade is saved
  3. For the remaining pitchers, all ERA's within .2 of the last 15 Grade get a 16. The next .2 get a 17, and so on until all are graded, max of 30
Calculate each pitchers control rating:
  1. Sort the pitchers by BB/9, highest-to-lowest
  2. The bottom 8% by IP get a W
  3. The highest 40% by IP get a Z
  4. The other pitchers get no control rating
  5. W pitchers get a grade adjustment of +2, other Non-Z pitchers get an adjustment of +1
Calculate each pitchers strikeout rating:
  1. Sort the pitchers by SO/IP, highest-to-lowest
  2. Pitchers at .55-.74 SO/IP get a Y
  3. Pitchers at .75-.94 SO/IP get an X
  4. Pitchers over .95 SO/IP get an XY
  5. The other pitchers get no strikeout rating
  6. This is the old school way of doing this
Calculate each pitchers HR rating:
  1. Sort the pitchers by HR/IP, highest-to-lowest
  2. The worst 6% by IP get an M
  3. The next worst 12% by IP get an L
  4. The best 6% by IP get an H
  5. The next best 12% by IP get a G
  6. The other pitchers get no HR rating
  7. M pitchers get a grade adjustment of +2, L pitchers +1, H pitchers -2, and G pitchers -1
Team Batting Average Adjustment:
  1. Build a spreadsheet that includes the team name and the team Batting Average. This should be done separately for each league as well
  2. Calculate the Standard Deviation based on the team BA
  3. Pitchers on teams that are 1 SD below the league average, meaning they faced the best hitters, get a +1 to their grade
  4. Pitchers on teams that are 1 SD above the league average, meaning they faced the worst hitters, get a -1 to their grade
  5. If a team is 2 SD of the league value adjust by 2
Recalculate each pitchers grade:
  1. Take the original calculated grade, adjust by the control adjustment, the homerun adjustment, and the Team ERA adjustment to determine the final grade (minimum of 1, maximum of 30). Concatenate in the final grade and the individual letter adjustments to come up with the final overall pitcher grade
  2. Use the edit player tool to edit the pitcher's grade for each pitcher
  3. For pitchers that appear on multiple teams, their new grade will have to be edited before they make an appearance on their new team
Just for a matter of reminiscence and amusement here is the original APBA Journal article on Weighted Pitching Grades:


August 1990 APBA Journal Cover


August 1990 APBA Journal Weighted Pitching Grades (Pg 1)

August 1990 APBA Journal Weighted Pitching Grades (Pg 2)



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