# CNN Fear & Greed Index Synthesis Algorithm

## Original CNN Fear & Greed Components (7 total):
1. Stock Price Momentum
2. Stock Price Strength  
3. Stock Price Breadth
4. Put/Call Options Ratio
5. Junk Bond Demand
6. Market Volatility (VIX)
7. Safe Haven Demand

## Our Implementation (5 components, excluding options):

### 1. Stock Price Momentum
- **Data Source**: S&P 500 Index (^GSPC) from yfinance
- **Algorithm**: 125-day moving average vs current price
- **Calculation**: (Current Price - 125-day MA) / 125-day MA * 100
- **Normalization**: Scale to 0-100 where negative = fear, positive = greed

### 2. Stock Price Strength  
- **Data Source**: NASDAQ 100 stocks new highs/lows
- **Algorithm**: 52-week new highs vs new lows ratio
- **Calculation**: Count stocks at 52w high / Total stocks * 100
- **Alternative**: Use RSI of major indices if individual stock data unavailable

### 3. Stock Price Breadth
- **Data Source**: NASDAQ 100 advancing vs declining stocks
- **Algorithm**: Advancing vs declining stocks ratio
- **Calculation**: Advancing stocks / Total stocks * 100
- **Implementation**: Use daily performance of our 96 QQQ constituents

### 4. Junk Bond Demand
- **Data Source**: HYG (High Yield Bond ETF) vs TLT (Treasury ETF)
- **Algorithm**: High yield bonds vs safe treasuries performance
- **Calculation**: (HYG 20-day return - TLT 20-day return) + offset
- **Normalization**: Scale where negative = fear (flight to safety)

### 5. Safe Haven Demand
- **Data Source**: GLD (Gold ETF) vs SPY (S&P 500 ETF)  
- **Algorithm**: Gold vs equity performance comparison
- **Calculation**: (SPY 20-day return - GLD 20-day return) + offset
- **Normalization**: Scale where negative = fear (flight to gold)

## Final Synthesis Algorithm:
1. Calculate each component (0-100 scale)
2. Equal weight average: (Component1 + Component2 + Component3 + Component4 + Component5) / 5
3. Final scale: 0=Extreme Fear, 25=Fear, 50=Neutral, 75=Greed, 100=Extreme Greed

## Required Data Sources:
- ^GSPC: S&P 500 Index (yfinance)
- HYG: High Yield Bond ETF (yfinance)
- TLT: 20+ Year Treasury ETF (yfinance)
- GLD: Gold ETF (yfinance)
- SPY: S&P 500 ETF (yfinance)
- QQQ constituents: Individual stock data for breadth calculation

## Implementation Timeline:
- Historical synthesis: 2000-01-01 to present
- Daily frequency matching CNN's publication schedule
- Store in database table: fear_greed_index