Contact Purity Index (plus SLUG): Comparing Willie Keeler and George Sisler
Contact Purity Index (plus SLUG): Comparing Willie Keeler and George Sisler
Full Control Group — Core Rates + CPI
Formulae
H/G = H ÷ G
BB/G = BB ÷ G
SO/G = SO ÷ G
CPI = H/G ÷ (BB/G + SO/G)
Weighted CPI = CPI × SLG
Results Table
What the Numbers Actually Say
Raw CPI Leader
- Keeler (4.45) → lowest failure system ever
Next
- Sisler (3.51) → still extremely high, but with more real load
Weighted CPI Leader
Keeler (1.85)
Sisler (1.64)
But now the gap shrinks significantly.
Critical Interpretation
Weighted CPI still slightly favors Keeler because:
his extreme strikeout suppression (0.06) is mathematically overwhelming
even modest SLG keeps him ahead
But this introduces a conceptual issue:
Keeler’s system is lighter
George Sisler vs Willie Keeler
The Difference Between Pure Contact and Complete Contact
Baseball history contains many great hitters.
Very few operate in the same system.
Fewer still push that system to its limit.
Two names stand at the edge:
Willie Keeler
George Sisler
At first glance, the numbers suggest Keeler is the purest hitter who ever lived.
And mathematically, that case is real.
The Case for Keeler
Keeler’s profile is extreme:
1.38 hits per game
0.25 walks per game
0.06 strikeouts per game
This produces:
CPI = 4.45 (highest ever)
He does something almost no one else has:
He nearly eliminates failure entirely
Strikeouts disappear.
Walks remain low.
The system becomes:
contact → hit
With almost no interruption.
But There Is a Cost
Keeler’s slugging:
- .415
This matters.
Because it tells us:
the system has been simplified
He is not carrying full offensive weight.
He is:
reducing the game to its lowest-resistance form
The Case for Sisler
Now consider Sisler:
1.37 hits per game
0.23 walks per game
0.16 strikeouts per game
CPI:
3.51 (still elite)
But with:
- .468 slugging
This Changes Everything
Sisler does not:
- remove failure as completely as Keeler
But he does something harder:
He sustains purity without reducing the system
The Structural Difference
Keeler
minimizes failure
minimizes force
simplifies the system
Sisler
minimizes failure
maintains force
absorbs the full system
Why This Matters
Pure contact is not just:
avoiding strikeouts
It is:
converting under real conditions
Keeler proves how clean the system can become.
Sisler proves:
how far it can be pushed without breaking
The Final Distinction
Keeler is:
the purest expression of contact efficiency
Sisler is:
the purest expression of contact under load
Final Line
Willie Keeler represents the theoretical limit of contact purity through system reduction, but George Sisler represents the practical limit of pure hitting—sustaining elite conversion, minimal mediation, and real offensive force within the full complexity of the game.