FIG.4
This indicates a relation between the score/G
of each team and a OPS game from 1995 to 2014.
OPS = On base percentage + Slugging average ( = OBP + SLG )
On base percentage (OBP) = ( H + BB + HP )/( AB + BB + HP + SF )
Slugging average (SLG) = TB / AB
H : hit
BB : base on balls
HP : hit by pitch
AB : at bat
SF : sacrifice fly
TB : total base (1B + 2B×2 + 3B×3 + HR×4)
1B : 1-bese hit
2B : 2-bese hit
3B : 3-bese hit
HR : Home run
There are a score/G and correlation most in the easy index in OPS.
OPS in NPB and the coefficient of correlation of the mark
from 1995 to 2014 are 0.952, in MLB same piriod are 0.955.
FIG.5
This slide indicates a change in OPS of NPB and MLB from 1995 to 2014.
MLB (=0.749) > NPB (0.723), difference is 0.026, which significant by a
probability of 99% statistically (p-value = 0.004, 1995-2014).
Directly, the difference in OPS causes the difference in score/G.
Attack > defence in MLB. Defence > attack in NPB.
FIG.6
FIG.7
These two slides show correlation of score/G clearly with OPS.
The score/G and a beautiful relation hang the easy
coefficienton OPS, and are drawn by an added thing.
FIG.8
This slides indicate the difference in OPS by DH system of NPB.
PL (=0.727) > CL (0.720), difference is 0.007, which is not also significant statistically by a probability of 90% (P-value=0.499, 1995-2014).
If it's the simple cause that OPS by DH system is impartial,
it's considered that there are no score/G differences by DH system.
FIG.9
AL (=0.758) > NL (0.741), difference is 0.018, which significant by a
probability of approximately 99% statistically (P-value=0.013, 1995-2014).
It's clear that the cause of this difference is a DH system.
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OPSは、簡単な指標の中では、「1ゲーム当たりの得点」と最も相関が高い。
OPS=出塁率+長打率
出塁率=(安打+四球+死球)/(打数+四球+死球+犠飛)
長打率=総塁打/打数
OPSに簡単な係数を掛けて足すことで、1995-2014年の NPB と ML Bの
「1ゲーム当たりの得点」ときれいに相関があることが示すことができる。
NPB と MLB での得点/Gについては、OPS の差に帰結できる。
MLB : 攻撃 > 守備
NPB : 守備 > 攻撃
DH制については、MLB（アメリカ）では、想像通りOPSを統計的有意
に増加させるが、NPB（日本）では、そうはならない。
今のところ、なぜDH制がNPB（日本）でOPSに反映されないか、明確でない。