Moving averages smooth out price noise to reveal trend direction. The simplest indicator and the most powerful when applied with discipline. 200-day MA alone, used as a long/cash filter, beats most active trading strategies on Indian markets over 20-year horizons.
SMA vs EMA vs WMA — the practical differences
| Type | Calculation | Responsiveness | Best for |
|---|---|---|---|
| SMA (Simple) | Average of N closes | Slow | Long-term trend (200-DMA) |
| EMA (Exponential) | Weighted toward recent prices | Fast | Short-term trend (20-EMA) |
| WMA (Weighted) | Linear weight toward recent | Medium | Mid-term (50-WMA) |
EMA reacts faster to price changes. SMA lags more but smoother. WMA sits between. For most retail strategies: 200-SMA for trend filter, 50-EMA + 20-EMA for entry timing.
The 50/200 golden cross + death cross
- Golden cross: 50-DMA crosses above 200-DMA. Classic bull-market confirmation.
- Death cross: 50-DMA crosses below 200-DMA. Bear-market signal.
On Nifty 50 since 2000: 4 golden crosses (2003, 2009, 2014, 2020) marked start of multi-year bulls. 3 death crosses (2008, 2011, 2020) marked corrections.
Lag is real — golden cross triggers 30-60 days after market low. Death cross triggers 30-60 days after market top. Trade-off: clear unambiguous signal vs missed early trend.
Dynamic support/resistance
MAs act as moving levels. Price respecting them = trend healthy. Price breaking them = trend at risk.
- 20-EMA: Short-term trend support. Pullbacks to 20-EMA in uptrends = entries.
- 50-DMA: Medium-term. Held = trend intact. Lost = trend caution.
- 200-DMA: Long-term regime line. Above = bull regime. Below = bear regime.
The 200-DMA filter (single-rule strategy)
Backtest 2000-2024 on Nifty 50: hold equity when Nifty > 200-DMA, switch to short-debt when below. Results:
- CAGR: ~11.5% (vs Nifty buy-and-hold ~12%)
- Max drawdown: ~22% (vs Nifty's ~58% in 2008)
- Sharpe ratio: 1.2 (vs Nifty's 0.7)
Slightly lower CAGR, half the drawdown, way better risk-adjusted return. Most retail investors who use this rule actually stay invested through bears because the rule did the de-risking automatically.
The MA ribbon trick
Plot 5, 8, 13, 21, 34, 55 EMAs together. When they fan out in order (5 highest in uptrend) = strong trend. When they compress = trend exhaustion. When they invert = trend reversal.
Pure visual pattern — fast trend assessment without indicator overload. Used by momentum traders for daily scans.
Common mistakes
- Optimising periods (curve-fitting). Standard periods (20, 50, 200) work because everyone watches them. Custom 17-EMA optimised on backtest fails on forward data.
- Trading every MA crossover on intraday charts. Whipsaws destroy returns. Use crossovers on daily+ charts.
- Treating 200-DMA bounce as definitive support. It works ~70% of time, fails 30%. Stop-loss below the level is non-negotiable.
- Ignoring MA slope. Rising 200-DMA = uptrend strong. Flat = sideways. Falling = downtrend. Direction matters more than level.
Sector-specific MA behaviour
- FMCG / Defensives: Trade above 200-DMA most years. Below 200-DMA = quality buying opportunity.
- Cyclicals (steel, cement): Move wildly across MAs. Use 200-week MA instead for stable signal.
- Banks: Sensitive to MA crossovers. Death crosses often precede 20%+ corrections.
- IT services: Tend to walk the 50-EMA in trends. Pullbacks to 50-EMA = entry.
Use the Position Sizing calculator with MA-based stop levels. Stop below 200-DMA for long-horizon positions; below 20-EMA for swing trades.