Technical Analysis
Technical Indicators Decoded — What They Measure and When They Fail
Technical indicators are mathematical transformations of price and volume data. Understanding what each indicator actually measures — and its limitations — is more useful than memorising its signals.
30+
indicators covered
3
indicator families
0
indicators that predict the future
What are Technical Indicators?
Technical indicators are mathematical formulas applied to price, volume, or open interest data to produce a derived value — typically displayed as a line, histogram, or oscillator on a chart. They do not predict the future. They describe what has already happened in a mathematically precise way, helping traders identify trends, measure momentum, spot potential exhaustion, and confirm breakouts. The RSI does not know what price will do tomorrow; it measures whether recent gains have been proportionally larger than recent losses over 14 sessions — which is useful context, but not prophecy.
Indicators fall into three families: trend indicators (moving averages, MACD) show the direction and strength of a trend; momentum oscillators (RSI, Stochastic) measure the rate of change and identify overbought or oversold conditions; and volume indicators (OBV, Volume Profile, VWAP) confirm whether price moves are supported by participation. The most common mistake is using multiple indicators from the same family — for example, MACD and two moving averages — which creates the illusion of confirmation but actually provides one signal three times.
6 Lessons
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Moving Averages — SMA vs EMA
What moving averages measure, why the EMA reacts faster, and how crossovers are misused.
Coming soonRSI — Relative Strength Index
How RSI measures momentum, what overbought/oversold actually means, and RSI divergence.
Coming soonMACD — Moving Average Convergence Divergence
MACD line, signal line, histogram — what each component measures and common misreadings.
Coming soonBollinger Bands
Standard deviation bands around a moving average — volatility, squeeze setups, and band walks.
Coming soonVolume Indicators — OBV and VWAP
On-Balance Volume and Volume Weighted Average Price for institutional footprint analysis.
Coming soonIndicator Combinations That Actually Work
How to combine one trend indicator, one oscillator, and one volume indicator without redundancy.
Coming soonCore Concepts
Lagging vs Leading Indicators
Most indicators are lagging — they confirm what has already happened (moving averages, MACD). A few attempt to lead — predicting reversals before they occur (RSI divergence, volume climax). Lagging indicators reduce false signals at the cost of late entries. Leading indicators provide early entries at the cost of more false signals.
Overbought and Oversold
RSI above 70 is conventionally called overbought; below 30 is oversold. In strong trends, RSI can stay overbought for months. These levels are more useful as divergence signals (price makes a new high but RSI does not) than as standalone sell or buy triggers.
Indicator Redundancy
Using MACD, two moving averages, and the EMA ribbon together does not provide four independent signals — they all measure the same thing: trend. Effective indicator setups combine one indicator from each family: trend, momentum, and volume.
VWAP
Volume Weighted Average Price — the average price paid for a stock, weighted by volume, from the open of the session. Institutional traders use VWAP as a benchmark. Price above VWAP is generally bullish intraday; below VWAP is bearish. Most relevant on intraday charts.
Frequently Asked Questions
What is the best technical indicator for Indian stock markets?▾
No single indicator is best — they measure different things. For trend direction, the 50-day and 200-day EMA are widely used. For momentum, RSI (14-period) is standard. For volume confirmation, OBV or delivery percentage data from NSE is more reliable than most indicators. The best setup combines one from each family without redundancy.
What does RSI actually measure?▾
RSI (Relative Strength Index) measures the average gain of up-sessions versus the average loss of down-sessions over a 14-session period, expressed as a 0–100 oscillator. An RSI of 70 means gains have been significantly larger than losses recently — not that the stock will fall. It measures the speed of price change, not its direction.
Why do technical indicators sometimes give false signals?▾
Indicators are derived from past price data and make no assumptions about the future. In trending markets, momentum indicators produce false reversal signals (RSI stays overbought). In ranging markets, trend indicators produce false breakout signals. Using market intelligence to first identify the regime — trending vs ranging — dramatically reduces false signals.
What is MACD and how do I read it?▾
MACD (Moving Average Convergence Divergence) measures the distance between a 12-period EMA and a 26-period EMA. The signal line is a 9-period EMA of the MACD line. When MACD crosses above the signal line, it is a bullish signal; below is bearish. The histogram shows the gap between MACD and its signal line — useful for spotting momentum shifts before crossovers.
How many indicators should I use on my chart?▾
Two to three indicators from different families is the effective range. One trend indicator (e.g., 20-day EMA), one momentum oscillator (e.g., RSI), and one volume indicator (e.g., OBV) gives you three independent perspectives. Adding more indicators from the same family does not add information — it adds noise.