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To Rank pitchers I created the RPI ranking. 
The RPI is calculated by dividing the # of runs given up by the # of innings pitched.
The Average Innings Pitched (AIP) is calculated by dividing total innings pitched by the # of games thrown.
Multiplying the RPI x AIP gives you the average runs given up per game (RPG). 
However a problem occurs when using the RPG to compare pitchers. Since relievers, closers, and starters have different AIP the pitcher with less innings has an advantage over those pitchers who average more innings. 
Baseball statisticians tried to fix the problem by using 9 as the multiplier to calculate the ERA.  The problem exists still because all the pitchers now have inflated RPI's.  But baseball used what they believe is fair for everyone.
There isn't a perfect way to numerically compare pitchers. I believe the fairest way is to use the RPI to compare pitchers.  If you'd rather multiply the AIP and the RPI and get what a pitcher averaged per game that's fine.

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Career Pitching
Tm        Name                    Yrs       G      AIP      RPI
Cle       Addie Joss          1902-10    31    8.14     .314
Was     Walter Johnson    1907-27    38    7.34     .343
Stl       Dizzy Dean          1930-47    26    5.72     .344
Phi A's  Eddie Plank          1901-17    36    7.20     .346
Chc      Mordecai Brown   1903-16    37    6.56     .359
Phi A's  Rollie Finger         1968-85   58    1.81      .360
Chw     Ed Walsh             1904-17   30    6.36      .363
Phi A's  Rube Waddell       1897-10   31    7.11      .364
Nym     Tom Seaver         1967-86   29    7.19      .369
Det       Troy Percival       1995-04   58    1.01      .371
LA        Don Drysdale        1956-69   37    6.50      .386
LA        Sandy Koufax       1955-66   33    5.59      .392
SF       C. Mathewson       1900-16   37    7.45      .393
Stl        Bob Gibson          1959-75   31    7.20      .395
Atl        John Smoltz         1988-04   37    5.31      .394
Nyy      Mike Mussina        1991-04   29    6.88      .395
Nyy      Whitey Ford         1950-67    31    7.14      .399

LA       Don Sutton          1966-88     33   6.79       .400
Hou     Don Wilson          1966-74     33   6.56       .403
Phi  Cleveland Alexander 1911-30   34   7.30       .403
Phi A's Satchel Paige       1948-65 30 2.81 .406
Chw Billy Pierce               1945-64 32 5.42 .406
Bal Jim Palmer                 1965-84 29 6.68 .411
BB Vic Willis                      1898-10 39 7.76 .412
Oak Dennis Eckersley          1975-98 44 3.89 .414
BB/MB Warren Spahn        1942-65 35 6.83 .415
SF McGinnity, Joe             1899-08 46 7.34 .417
Chc Fergie Jenkins             1965-83 34 6.62 .424
Cle Hoyt Wilhelm               1952-72 41 2.07 .424
Oak Jim Catfish Hunter       1965-79 33 6.91 .425
LA Orel Hershiser               1983-00 29 6.00 .425
SF Gaylord Perry               1962-83 35 6.75 .426
Hou Larry Dierker               1964-77 25 6.17 .426
Phi A's Lefty Grove P         1925-41 36 6.51 .428
Cle Stan Coveleski             1912-28 32 6.36 .428
Nyy Ron Guidry                  1975-88 26 5.89  .429
Min Bert Blyleven               1970-92 31 7.03 .432
Nyy Kevin Brown                 1986-04 26 6.47 .432
Cle Cy Young                      1890-11 41 8.10 .433
Phi Robin Roberts                1948-66 35 6.86 .434
Nyy Randy Johnson             1988-04 30 6.74 .435
SF Juan Marichal                 1960-75 29 7.05 .438
Det Jim Bunning 1955-71 34 6.10 .439
Chw Red Faber 1914-33 33 6.24 .449
Cle Early Wynn 1939-63 30 6.57 .454
Cin Eppa Rixey 1912-33 32 6.36 .459
Nyy Lefty Gomez 1930-43  27 6.33 .463
Nyy Jack Chesbro 1899-09 36 7.79 .464
Nyy Waite Hoyt  1918-38  30 5.31 .464
Hou Nolan Ryan 1966-93 29 6.55 .464
Stl Jesse Haines 1918-37 30 5.67 .468
Det Fred Hutchinson 1939-53 24 5.58 .471
Phi A's Chief Bender P 1903-25 28 6.27 .471
Phi Steve Carlton 1965-88 29 6.61 .482
SF Marquard, Rube 1908-25 27 6.02 .488
Hou Jim Umbricht 1959-63 17 3.32 .493
Nyy Red Ruffing 1924-47 28 6.91 .500
SD Randy Jones 1973-82 30 6.16 .500
Min Jim Kaat 1959-83 36 4.77 .506
Chw Ted Lyons 1923-46 28 7.06 .509
Nyy Babe Ruth 1914-33 16 7.05 .517
Cin Charles Radbourn 1881-91 48 8.54 .524
Brk Grimes, Burleigh 1916-34 32 6.63 .525
Atl Phil Niekro 1964-87 37 6.0 .528
Cle Mel Harder 1928-47 29 5.74 .533
Nyy Herb Pennock 1912-34 28 5.43 .545
Hou Mike Scott 1979-91 26 5.60 .545
BB Kid Nichols 1890-06 40 7.78 .561
Nyy Dazzy Vance 1915-35 28 6.67 .584
Pit Pud Galvin 1875-92 44 8.55 .588
Cin Amos Rusie 1889-01 46 8.03 .613
Chc Clark Griffith 1891-14 22 6.16 .651

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