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:
Missing player games extrapolated
(Numbers in italics include some games for which Retrosheet is missing play-by-play data.)
Player records with missing games excluded
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
1926
PIT
23
4
0.0
0.0
-0.0
-0.0
1927
PIT
24
2
0.3
0.4
-0.1
-0.1
1928
-
25
-
-
-
-
-
1929
-
26
-
-
-
-
-
1930
PHA
27
33
7.5
8.5
0.4
-0.7
1931
PHA
28
30
10.9
9.6
3.0
1.7
1932
PHA
29
37
11.3
14.3
-0.8
-2.4
1933
PHA
30
33
10.5
9.5
2.6
1.4
1934
PHA
31
37
6.9
7.5
0.6
-0.4
1935
PHA
32
27
6.9
6.9
1.3
0.4
1936
SLA
33
21
3.2
5.3
-1.4
-2.0
------
------
------
------
------
CAREER (reg. season)
224
57.5
62.1
5.7
-2.1
------
------
------
------
------
PostSeason (career)
1
0.0
0.0
-0.0
-0.0
------
------
------
------
------
COMBINED
225
57.5
62.1
5.7
-2.1
Expected Player Won-Lost Records
Value Decomposition
Season
Team
Age
Games
eWins
eLosses
eWORL
eWOPA
1926
PIT
23
4
0.0
0.0
-0.0
-0.0
1927
PIT
24
2
0.2
0.4
-0.1
-0.1
1928
-
25
-
-
-
-
-
1929
-
26
-
-
-
-
-
1930
PHA
27
33
7.1
9.0
-0.3
-1.4
1931
PHA
28
30
9.7
10.8
0.7
-0.7
1932
PHA
29
37
11.8
13.8
0.3
-1.4
1933
PHA
30
33
10.2
9.8
2.1
0.9
1934
PHA
31
37
6.9
7.4
0.8
-0.2
1935
PHA
32
27
6.7
7.2
0.8
-0.1
1936
SLA
33
21
3.5
4.9
-0.7
-1.3
------
------
------
------
------
CAREER (reg. season)
224
56.1
63.4
3.5
-4.3
------
------
------
------
------
PostSeason (career)
1
0.0
0.0
-0.0
-0.0
------
------
------
------
------
COMBINED
225
56.2
63.4
3.5
-4.3
Basic Decomposition of eWins, eLosses
(Regular Season only)
Batting
Baserunning
Pitching
Fielding
Season
Team
Wins
Losses
Wins
Losses
Wins
Losses
Wins
Losses
1926
PIT
0.0
0.0
-
-
0.0
0.0
0.0
0.0
1927
PIT
0.1
0.0
0.0
0.0
0.2
0.3
0.0
0.0
1928
-
-
-
-
-
-
-
-
-
1929
-
-
-
-
-
-
-
-
-
1930
PHA
0.3
0.7
0.0
0.0
6.8
7.7
0.2
0.4
1931
PHA
0.8
1.0
0.0
0.0
8.8
9.5
0.2
0.2
1932
PHA
0.7
1.4
0.0
0.0
10.7
11.6
0.6
0.6
1933
PHA
0.7
1.1
0.1
0.1
9.0
8.5
0.3
0.2
1934
PHA
0.5
0.5
0.0
0.0
6.3
6.6
0.1
0.2
1935
PHA
0.4
0.9
0.1
0.0
6.1
6.1
0.1
0.2
1936
SLA
0.1
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
1926
PIT
0.491
0.396
0.00
-0.00
1927
PIT
0.478
0.421
-0.00
0.00
1928
-
-
-
-
-
1929
-
-
-
-
-
1930
PHA
0.491
0.422
-0.00
0.01
1931
PHA
0.490
0.426
-0.00
0.03
1932
PHA
0.488
0.423
-0.00
0.04
1933
PHA
0.490
0.430
-0.00
-0.07
1934
PHA
0.492
0.422
-0.01
-0.02
1935
PHA
0.487
0.421
-0.00
-0.00
1936
SLA
0.491
0.424
-0.00
-0.01
------
------
------
------
------
------
CAREER
0.490
0.424
-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
1926
PIT
0.04
1.34
0.06
0.185
-0.155
-0.006
1927
PIT
0.41
1.24
0.51
-0.070
0.074
-0.024
1928
-
-
-
-
-
-
-
1929
-
-
-
-
-
-
-
1930
PHA
0.91
0.97
0.89
-0.011
0.030
-0.010
1931
PHA
0.89
1.25
1.11
0.021
0.033
-0.003
1932
PHA
1.06
0.89
0.94
-0.028
0.001
-0.007
1933
PHA
1.06
0.96
1.02
0.002
0.023
0.005
1934
PHA
0.93
0.99
0.92
-0.020
0.017
-0.001
1935
PHA
1.02
0.87
0.88
-0.006
0.024
-0.001
1936
SLA
0.94
1.23
1.16
-0.038
-0.015
-0.010
------
------
------
------
------
------
------
------
CAREER
0.97
0.99
0.97
-0.009
0.018
-0.004
eWins, eLosses by Position
(Regular Season only)
Starting Pitcher
Relief Pitcher
Pitcher Offense
Season
Team
eWin
eLoss
eWOPA
eWin
eLoss
eWOPA
eWin
eLoss
eWOPA
1926
PIT
-
-
-
0.0
0.0
-0.0
0.0
0.0
-0.0
1927
PIT
0.2
0.3
-0.2
0.0
0.0
-0.0
0.1
0.0
0.0
1928
-
-
-
-
-
-
-
-
-
-
1929
-
-
-
-
-
-
-
-
-
-
1930
PHA
5.7
6.1
-0.5
1.5
1.9
-0.4
0.3
0.7
-0.1
1931
PHA
7.8
8.3
-0.6
1.2
1.4
-0.2
0.8
1.0
0.2
1932
PHA
9.7
10.3
-0.6
1.5
1.9
-0.5
0.7
1.4
-0.1
1933
PHA
8.4
7.5
0.9
0.9
1.1
-0.1
0.8
1.2
0.0
1934
PHA
4.1
5.3
-1.1
2.2
1.7
0.4
0.5
0.6
0.2
1935
PHA
5.0
5.2
-0.1
1.2
1.1
0.1
0.4
0.9
-0.1
1936
SLA
2.7
4.0
-1.3
0.7
0.7
0.0
0.1
0.4
-0.1
------
------
------
------
------
------
------
------
------
------
------
CAREER
43.6
47.0
-3.4
9.2
9.8
-0.6
3.7
6.2
-0.0
pWins, pLosses by Position
(Regular Season only)
Starting Pitcher
Relief Pitcher
Pitcher Offense
Season
Team
pWin
pLoss
pWOPA
pWin
pLoss
pWOPA
pWin
pLoss
pWOPA
1926
PIT
-
-
-
0.0
0.0
-0.0
0.0
0.0
-0.0
1927
PIT
0.2
0.3
-0.1
0.0
0.0
-0.0
0.0
0.1
-0.0
1928
-
-
-
-
-
-
-
-
-
-
1929
-
-
-
-
-
-
-
-
-
-
1930
PHA
5.8
6.0
-0.1
1.5
1.9
-0.4
0.2
0.7
-0.2
1931
PHA
8.6
7.4
1.2
1.5
1.2
0.3
0.8
1.0
0.2
1932
PHA
9.3
10.7
-1.4
1.3
2.1
-0.9
0.7
1.4
-0.1
1933
PHA
8.5
7.5
1.0
1.0
1.0
0.0
1.0
1.0
0.4
1934
PHA
4.0
5.4
-1.4
2.3
1.6
0.8
0.6
0.5
0.3
1935
PHA
4.9
5.2
-0.3
1.5
0.8
0.7
0.5
0.9
-0.0
1936
SLA
2.4
4.2
-1.8
0.6
0.7
-0.1
0.1
0.4
-0.1
------
------
------
------
------
------
------
------
------
------
------
CAREER
43.8
46.8
-3.0
9.7
9.3
0.5
3.9
6.0
0.4
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