Roy Mahaffey - Player Record
Baseball Player Won-Loss Records
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Roy Mahaffey - Player Record
Traditional Statistics and Splits (Retrosheet)
(Player Game Log)

Compare Roy Mahaffey to:
Only includes games for which Retrosheet has released play-by-play data
(Numbers in italics indicate Retrosheet is missing some games)

Player records with missing games extrapolated

Most Similar Players to Roy Mahaffey

Positional Average (Weighted Avg of Options): 0.500 (1-Year) (9-Year) (Long-Run)

Positional Averages for Pitchers (Wgted Avg of Options): 0.500 vs. Different Values for Starting vs. Relief Pitchers: (Empirical) (Based on Pitchers who Do Both)

Basic Player Won-Lost Records
Value Decomposition
Season Team Age Games pWins pLosses pWORL pWOPA
1926PIT23
4
0.00.0-0.0-0.0
1927PIT24
2
0.30.4-0.1-0.1
1928-25
-
----
1929-26
-
----
1930PHA27
33
7.58.50.4-0.7
1931PHA28
30
10.99.63.01.7
1932PHA29
37
11.314.3-0.8-2.4
1933PHA30
33
10.59.52.61.4
1934PHA31
37
6.97.50.6-0.4
1935PHA32
27
6.96.91.30.4
1936SLA33
21
3.25.3-1.4-2.0
------ ------ ------ ------ ------
CAREER (reg. season)
224
57.562.15.7-2.1
------ ------ ------ ------ ------
PostSeason (career)
1
0.00.0-0.0-0.0
------ ------ ------ ------ ------
COMBINED
225
57.562.15.7-2.1


Expected Player Won-Lost Records
Value Decomposition
Season Team Age Games eWins eLosses eWORL eWOPA
1926PIT23
4
0.00.0-0.0-0.0
1927PIT24
2
0.20.4-0.1-0.1
1928-25
-
----
1929-26
-
----
1930PHA27
33
7.19.0-0.3-1.4
1931PHA28
30
9.710.80.7-0.7
1932PHA29
37
11.813.80.3-1.4
1933PHA30
33
10.29.82.10.9
1934PHA31
37
6.97.40.8-0.2
1935PHA32
27
6.77.20.8-0.1
1936SLA33
21
3.54.9-0.7-1.3
------ ------ ------ ------ ------
CAREER (reg. season)
224
56.163.43.5-4.3
------ ------ ------ ------ ------
PostSeason (career)
1
0.00.0-0.0-0.0
------ ------ ------ ------ ------
COMBINED
225
56.263.43.5-4.3


Basic Decomposition of eWins, eLosses
(Regular Season only)
Batting Baserunning Pitching Fielding
Season Team Wins Losses Wins Losses Wins Losses Wins Losses
19260.0
0.0
-
-
0.0
0.0
0.0
0.0
19270.1
0.0
0.0
0.0
0.2
0.3
0.0
0.0
1928
-
-
-
-
-
-
-
-
-
1929
-
-
-
-
-
-
-
-
-
19300.3
0.7
0.0
0.0
6.8
7.7
0.2
0.4
19310.8
1.0
0.0
0.0
8.8
9.5
0.2
0.2
19320.7
1.4
0.0
0.0
10.7
11.6
0.6
0.6
19330.7
1.1
0.1
0.1
9.0
8.5
0.3
0.2
19340.5
0.5
0.0
0.0
6.3
6.6
0.1
0.2
19350.4
0.9
0.1
0.0
6.1
6.1
0.1
0.2
19360.1
0.4
0.0
0.0
3.4
4.2
0.1
0.3
------ ------ ------ ------ ------ ------ ------ ------ ------ ------
CAREER
3.4
5.9
0.3
0.2
51.4
54.6
1.7
2.0


Positional Teammate Adjustments
Season Team Average Repl. Level Offensive Defensive
19260.4910.3960.00-0.00
19270.4780.421-0.000.00
1928
-
----
1929
-
----
19300.4910.422-0.000.01
19310.4900.426-0.000.03
19320.4880.423-0.000.04
19330.4900.430-0.00-0.07
19340.4920.422-0.01-0.02
19350.4870.421-0.00-0.00
19360.4910.424-0.00-0.01
------ ------ ------ ------ ------ ------
CAREER
0.4900.424-0.02-0.02


Contextual Adjustments
(Regular Season only)
Context Multipliers Win Adjustments
Actual
Season Team Inter-Game Intra-Game Combined Inter-Game Intra-Game Expected
19260.041.34
0.06
0.185
-0.155
-0.006
19270.411.24
0.51
-0.070
0.074
-0.024
1928
-
--
-
-
-
-
1929
-
--
-
-
-
-
19300.910.97
0.89
-0.011
0.030
-0.010
19310.891.25
1.11
0.021
0.033
-0.003
19321.060.89
0.94
-0.028
0.001
-0.007
19331.060.96
1.02
0.002
0.023
0.005
19340.930.99
0.92
-0.020
0.017
-0.001
19351.020.87
0.88
-0.006
0.024
-0.001
19360.941.23
1.16
-0.038
-0.015
-0.010
------ ------ ------ ------ ------ ------ ------ ------
CAREER
0.970.99
0.97
-0.009
0.018
-0.004


eWins, eLosses by Position
(Regular Season only)
Starting PitcherRelief PitcherPitcher Offense
Season Team eWineLosseWOPAeWineLosseWOPAeWineLosseWOPA
1926--
-
0.00.0
-0.0
0.00.0
-0.0
19270.20.3
-0.2
0.00.0
-0.0
0.10.0
0.0
1928
-
--
-
--
-
--
-
1929
-
--
-
--
-
--
-
19305.76.1
-0.5
1.51.9
-0.4
0.30.7
-0.1
19317.88.3
-0.6
1.21.4
-0.2
0.81.0
0.2
19329.710.3
-0.6
1.51.9
-0.5
0.71.4
-0.1
19338.47.5
0.9
0.91.1
-0.1
0.81.2
0.0
19344.15.3
-1.1
2.21.7
0.4
0.50.6
0.2
19355.05.2
-0.1
1.21.1
0.1
0.40.9
-0.1
19362.74.0
-1.3
0.70.7
0.0
0.10.4
-0.1
------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------
CAREER
43.647.0
-3.4
9.29.8
-0.6
3.76.2
-0.0


pWins, pLosses by Position
(Regular Season only)
Starting PitcherRelief PitcherPitcher Offense
Season Team pWinpLosspWOPApWinpLosspWOPApWinpLosspWOPA
1926--
-
0.00.0
-0.0
0.00.0
-0.0
19270.20.3
-0.1
0.00.0
-0.0
0.00.1
-0.0
1928
-
--
-
--
-
--
-
1929
-
--
-
--
-
--
-
19305.86.0
-0.1
1.51.9
-0.4
0.20.7
-0.2
19318.67.4
1.2
1.51.2
0.3
0.81.0
0.2
19329.310.7
-1.4
1.32.1
-0.9
0.71.4
-0.1
19338.57.5
1.0
1.01.0
0.0
1.01.0
0.4
19344.05.4
-1.4
2.31.6
0.8
0.60.5
0.3
19354.95.2
-0.3
1.50.8
0.7
0.50.9
-0.0
19362.44.2
-1.8
0.60.7
-0.1
0.10.4
-0.1
------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------
CAREER
43.846.8
-3.0
9.79.3
0.5
3.96.0
0.4






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