EMA vs SMA : quelle moyenne mobile choisir ?

The math, briefly

SMA(20) is the arithmetic mean of the last 20 closes. SMA(50) is the mean of the last 50. Every candle has equal weight, so a single huge candle from 20 sessions ago still pulls the line as much as today's candle.

EMA reweights so that newer candles count more. The multiplier is 2/(N+1) where N is the period. EMA(20) puts ~9.5% weight on the most recent close, ~9.5% × 0.905 on the previous, and so on. The result tracks the price closer.

When to use which

Trend-following: EMA reacts faster, so EMA crosses fire earlier. That's good if you want to be in trends early; bad if you want fewer false signals.

Range-bound markets: SMA stays steadier, so it's a cleaner mid-line for a channel. Lots of traders watch SMA(200) on equities specifically because it's slow — it captures the multi-month structure.

The conventional split: short-term traders favour EMA (12/26/50), long-term investors quote SMA (200).

How Signodex uses moving averages

Signodex computes SMA(20), SMA(50), SMA(200), EMA(12) and EMA(26) on every chart. The MACD layer is built on EMA(12) and EMA(26). The AI characterises position relative to each ("Price is above the 50-EMA but below the 200-SMA — short-term constructive, long-term still bearish") without making a trade recommendation.