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DATA SOURCES & METHODOLOGICAL CODEBOOK FOR FCMI STUDY
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1. FOOTBALL TACTICAL METRICS (Source: Opta via FBref - World Cup 2022)
   - SPI_raw: Average Passes per Possession Sequence (FBref Squad Possession Table).
   - TDI_raw: Tactical Democracy Index calculated as [1 - Gini Coefficient of Progressive Passes] across team positions.
   - CRI_raw: Ratio of Tackles + Interceptions in the Defensive 3rd to Total Defensive Actions (FBref Squad Defensive Actions Table).
   - PCI_raw: Pass Completion Percentage Under Opposition Pressure (FBref Squad Passing Table).

2. SOCIOECONOMIC AND MACRO DATA
   - HDI: Human Development Index 2022 (UNDP Human Development Report).
   - Log_GDP: Natural Logarithm of GDP per capita, PPP in international dollars (World Bank 2022 Data).
   - FIFA_Rank: Official FIFA World Ranking prior to November 2022 tournament start.

3. REPLICATION & VALIDATION
   Running 'Code_and_Data_Script.py' will strictly process these raw inputs through
   Min-Max feature scaling and yield the exact statistical outputs in Table 1 & Table 2.
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