FR簡單計算
Fielding Runs are based on the player's fielding statistics at each position
compared to the league average for this number of innings played. This is the
basic formula:
PFR/(PO-SO for team)-LFR/(PO-SO for league*Player Innings
PFR is the player fielding rate, while LFR is the league fielding rate. The
rates at each position are as follows:
1B:.2(2A-E)
P, 2B, SS, 3B: .2(PO+2A-E+DP)
OF:.2(PO+4A-E+DP)
C:.2(PO-SO+.4(A-CS)-E+DP+PB/2)
There are other factors added in to adjust for the handedness of the team's
pitchers, and the amount of double play opportunites for the player.
To adjust for the handedness of pitchers, the basic formula is multiplied by
this equation:
(1+ADJ*YF*DLHP)
ADJ is the adjustmen figure appropriate for the position and statistic. No
adjustment is needed for catchers or center fielders. These are the
adjustment figures for each positon and stat:
1B:n/a PO, -.4 A
2B:.23 PO, -.27 A
3B:-.22 PO, .34 A
SS:-.1 PO, .14 A
LF:-.16 PO, n/a A
RF:.09 PO, n/a A
YF is the year factor, necessary because this factory steadily increased in
importance for 1910 to 1970. Before 1910 the YF is 0, so no adjustment is
needed. The adjustment can be calculated for each year from 1910 through 1970
by subtractting 1910 from th ear in question and then dividing by 60. After
1970 the YF is always 1.
DLHP is the difference in the precentage of left-handed pitching from the
league average.
DP opportunities were estimated from hits, BB, HBP, and HR allowed, plus
errors committed. Using a multiplier for homers to account for DP
opportunites lost did not improve the estimate in years where there are
actual data: the average error in these years was around 2 percent. The
formula for calculating DP opportunites is:
.662(H-HR+BB+HBP+.575E)
Individual DPs were divided by the team DP opp. divided by the league average
DP opp. fro catchers, there is an aditioinal defensive calculation made to
rate them on other defensive aspects. I won't go into that here, though,
since we're talking about a shortstop.
I answered the question about how they are calculated, and I'll answer the
others as best I can:
2.Positions that demand more defense (SS, 2B, C, 3B) tend to have more
fielding runs than the outfielders and 1B, which is to be expected. You can't
really compare defensive value between different positions by using fielding
runs. Since fielding runs is part of Batter Fielder Wins or TPR, that really
is a good thing about it, because it gives a positional adjustment for
positions from which less offense is expected.
3.They really aren't all that accurate compared to other fielding metrics,
but they are a decent metric if it's all you have access to.
4.The 2005 ESPN Baseball Encyclopedia has fielding runs listed for every
player in MLB history, and in every season.
http://www.baseball-fever.com/showthread.php?t=32745
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