How the Fear/Greed Index is calculated (so you can stop freaking out about a "sentiment" indicator).
Market Momentum — S&P 500 vs its 125-day moving average
Stock Price Strength — NYSE 52-week highs vs lows
Stock Price Breadth — advancing vs declining volume (McClellan Volume Summation)
Put/Call Options — 5-day average put/call ratio
Market Volatility — VIX vs its 50-day moving average
Safe Haven Demand — stocks vs Treasury bonds (20-day returns)
Junk Bond Demand — junk vs investment-grade yield spread