SMA vs EMA
SMA and EMA are both moving averages, but they weight price data differently. SMA gives equal weight to all periods; EMA emphasizes recent prices, making it more responsive.
Side-by-side comparison
| Feature | SMA | EMA |
|---|---|---|
| Weighting | Equal weight to all periods | More weight to recent prices |
| Responsiveness | Slower, smoother | Faster, more reactive |
| Best for | Long-term trend identification | Short-term trading signals |
| Lag | Higher | Lower |
| Noise | Less noise | More noise (more signals) |
| CommonQuant DSL | sma(period) | ema(period) |
Frequently asked questions
Should I use SMA or EMA for day trading?
EMA is generally preferred for day trading because it reacts faster to price changes. SMA is better for swing trading or identifying long-term trends.
Why do traders use both SMA and EMA?
Combining a slow SMA with a fast EMA creates crossover strategies. The SMA defines the trend, while the EMA provides entry/exit signals.