Indicators & Oscillators
Technical indicators are mathematical calculations based on price and volume data. They help traders identify trend direction, momentum, and potential reversal points. However, no indicator is perfect — they all lag price and work best in specific market conditions.
RSI (Relative Strength Index) measures momentum on a scale of 0-100. RSI above 70 is considered overbought (potential sell signal), below 30 is oversold (potential buy signal). In strong trends, RSI can remain overbought or oversold for extended periods — this is called trend-following RSI. The best RSI signals occur when the price makes a new high but RSI does not — a bearish divergence.
MACD (Moving Average Convergence Divergence) consists of two lines: the MACD line (12-day EMA minus 26-day EMA) and the Signal line (9-day EMA of MACD). A bullish signal occurs when MACD crosses above the Signal line. A bearish signal is the reverse. The histogram shows the distance between the two lines — expanding histogram = strengthening trend.
Bollinger Bands consist of a 20-day moving average with upper and lower bands 2 standard deviations away. Prices tend to stay within the bands 95% of the time. Prices touching the upper band in an uptrend = strength. Prices touching the lower band in a downtrend = weakness. A "Bollinger Squeeze" (bands narrowing) precedes explosive moves in either direction.
Volume indicators confirm price signals. On-Balance Volume (OBV) adds volume on up days and subtracts on down days — rising OBV during price consolidation signals accumulation. VWAP (Volume Weighted Average Price) is the most important intraday indicator, used by institutional investors to benchmark trade execution.
Key warning: Never use indicators in isolation. Combine RSI (momentum) with MACD (trend) and volume to form a complete picture. Indicators calculated from the same data will often give the same signal simultaneously — that is not confirmation, it is redundancy.
Practical Exercises
- 1
Set up RSI and MACD on a Nifty 50 stock chart — identify 3 buy signals where both confirm each other
- 2
Find an example of RSI divergence (price makes new high, RSI does not) in the last 6 months
- 3
Observe Bollinger Band squeezes in the last 1 year — did they precede breakouts?
Key Takeaways
RSI above 70 = overbought, below 30 = oversold; divergence is the most reliable RSI signal
MACD crossovers signal trend changes; expanding histogram = strengthening momentum
Bollinger Bands measure volatility; squeeze precedes breakout
Always combine multiple indicators with price action — never trade a single indicator in isolation
Chapter Quiz
1. RSI above 70 indicates:
2. What is a bearish RSI divergence?
3. A Bollinger Band squeeze indicates:
4. VWAP is primarily used for:
* This content is for educational purposes only and does not constitute financial advice. Investments in securities markets are subject to market risks. Consult a SEBI-registered financial advisor for personalized guidance.