Moving Averages
Moving averages smooth out price data to reveal the underlying trend. They're one of the most widely used technical indicators.
A moving average calculates the average price over a set period. Each new candle adds new data and drops the oldest, hence "moving."
What is a Moving Average?
A moving average (MA) shows:
- The average price over a period
- Updated with each new candle
- Plotted as a line on the chart
Purpose: Filter out noise and highlight the trend.
Types of Moving Averages
Simple Moving Average (SMA)
All prices weighted equally:
- 20-day SMA = Sum of last 20 closes ÷ 20
- Reacts slowly to price changes
- Smoother line
Exponential Moving Average (EMA)
Recent prices weighted more heavily:
- Reacts faster to price changes
- More responsive to current conditions
- Slightly more complex calculation
| Aspect | SMA | EMA |
|---|---|---|
| False signals | Fewer | More |
Most traders prefer EMA for shorter periods (9, 20) and SMA for longer periods (50, 200).
Common Moving Average Periods
| Period | Use Case |
|---|---|
| 9 or 10 | Very short-term |
| 20 or 21 | Short-term (1 month) |
| 50 | Medium-term |
| 100 | Medium-long term |
| 200 | Long-term (major trend) |
Using Moving Averages
Trend Identification
| Price Position | Interpretation |
|---|---|
| Price crossing above MA | Potential trend change (bullish) |
| Price crossing below MA | Potential trend change (bearish) |
Support and Resistance
Moving averages often act as dynamic support/resistance:
- In uptrends: Pullbacks to 20 or 50 EMA often provide buying opportunities
- In downtrends: Rallies to 20 or 50 EMA often provide selling opportunities
The 200-day moving average is watched by many institutional investors. Price above 200-day is generally considered bullish.
Moving Average Crossovers
Golden Cross
- 50-day MA crosses above 200-day MA
- Bullish signal
- Often marks start of uptrend
Death Cross
- 50-day MA crosses below 200-day MA
- Bearish signal
- Often marks start of downtrend
Note: These are lagging signals – the move may already be well underway.
Multiple Moving Averages
Many traders use multiple MAs:
- Short-term (20) for entries
- Medium-term (50) for trend confirmation
- Long-term (200) for major trend
When all align (price above 20 above 50 above 200): Strong uptrend.
Limitations
| Limitation | Explanation |
|---|---|
| No price target | Tells direction, not destination |
| Different periods, different signals | What works for one stock may not work for another |
Key Takeaways
- Moving averages smooth price to show trend
- EMA is faster, SMA is smoother
- Price above MA = bullish; below = bearish
- 200-day MA is a major long-term indicator
- Golden/Death crosses signal major trend changes
Next: Let's learn about RSI – a momentum indicator that shows overbought and oversold conditions.
Sources & Disclaimer
- Standard Market Conventions for Technical Analysis
- BSE/NSE Charting and Analysis Guides
Note: Any benchmarks (e.g., "Good ROE is > 20%", or specific P/E ranges) are simplified industry heuristics for educational purposes. True evaluation depends on specific industry context, market cycles, and individual company circumstances.