Technical indicators are mathematical calculations based on historical price and volume data to predict future price movements. The best ones help traders identify trends, reversals, and momentum shifts.
These tools analyze statistical patterns in price movements to generate buy/sell signals. Most fall into three categories: trend-following, momentum, and volatility. For example, the moving average convergence divergence (MACD) compares short-term and long-term price trends to signal changes in momentum.
| Category | Example | Purpose |
|---|---|---|
| Trend-Following | Moving Averages | Identify direction and strength of trends |
| Momentum | Relative Strength Index (RSI) | Measure speed and change of price movements |
| Volatility | Bollinger Bands | Assess market risk and potential price ranges |
Many traders confuse technical indicators with fundamental analysis. Unlike fundamentals (which assess company health), technical indicators focus solely on price action. Another mistake is relying on just one indicator. For example, combining MACD with RSI provides stronger signals than either alone.
The Relative Strength Index (RSI) measures momentum on a 0-100 scale. Values above 70 suggest overbought conditions, while below 30 indicate oversold. In 2023, Tesla's stock hit RSI 75 before a 15% drop, demonstrating the indicator's predictive power.
Indicators work best in trending markets. For instance, moving averages excel during strong uptrends or downtrends. However, they often fail in choppy, sideways markets. According to Investopedia, combining multiple indicators reduces false signals.
I once used Bollinger Bands to trade Apple stock during its 2022 earnings season. The bands widened before earnings, signaling increased volatility, and I entered a straddle option strategy accordingly.