Chin Durability Index

Overview

This pillar analyzes a fighter's historical resilience to significant strikes and knockdowns to produce a durability score. It's essential for predicting fight outcomes, especially in markets concerning method of victory or whether a fight goes the distance.

What It Does

The Chin Durability Index aggregates a fighter's entire professional career data, focusing on key metrics like KO losses, knockdowns absorbed, and significant strikes taken per minute. It adjusts these statistics for the quality of opposition faced, creating a single, comparable score. The model also heavily weights recent performances, as a fighter's ability to absorb damage can change rapidly.

Why It Matters

A fighter's chin is a great equalizer and a critical, often overlooked, variable in fight prediction. This index provides a data-driven measure of durability that can reveal hidden value in fighters who can weather storms against powerful, but less resilient, opponents.

How It Works

First, we collect career data on KO/TKO losses, knockdowns suffered, and strikes absorbed. Second, these figures are normalized per 15 minutes of fight time and adjusted based on the power-ranking of opponents. Third, a recency bias is applied, penalizing more for recent knockout losses. Finally, these weighted factors are combined into a score from 1-100.

Methodology

The index is calculated using a weighted formula: CDI = (100 - (5 * KDL) - (3 * KDS_15)) * QOC * RF. KDL is career KO/TKO losses. KDS_15 is knockdowns suffered per 15 minutes. QOC is a Quality of Opposition Coefficient (0.8-1.2) based on opponents' average finishing rate. RF is a Recency Factor that applies a 1.5x penalty for KO losses within the last 18 months.

Edge & Advantage

This pillar provides an edge by isolating a fighter's defensive resilience, offering a crucial counterpoint to offensive stats that often dominate public analysis.

Key Indicators

• KO/TKO Loss Rate

  high

  The percentage of a fighter's total losses that have come via knockout or technical knockout.

• Knockdowns Absorbed per 15 Min

  high

  The average number of times a fighter is knocked down, normalized to a full championship fight length.

• Recovery Evidence

  medium

  Qualitative assessment of how quickly a fighter recovers after being visibly stunned or knocked down in past fights.

Data Sources

• UFCStats

  Official fight-by-fight statistics for all UFC events, including significant strikes and knockdowns.

• Tapology

  Comprehensive MMA database with fighter records across numerous promotions, useful for non-UFC fight history.

Example Questions This Pillar Answers

• → Will the fight between Jon Jones and Tom Aspinall go the distance?
• → Will Conor McGregor win by KO/TKO against Michael Chandler?
• → Will the main event fight end in under 2.5 rounds?

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