Moving averages: EMA, SMA and the golden cross
Moving averages filter out price noise and show direction; a short average crossing a long one is one of the best-known signs that a trend may be changing.
In the daily chart above you see three lines above or below price. The orange line is the exponential average of the last 20 days (EMA20), the light grey line the exponential average of the last 50 days (EMA50), and the dark grey line the simple average of the last 200 days (SMA200).
A simple average (SMA) is the plain average of the last N closes; every day carries equal weight. An exponential average (EMA) gives more weight to recent days, so it reacts to price faster. Short averages show the short-term direction, long averages the main direction.
The order of the three lines tells you a lot. If orange is on top, dark grey at the bottom and price above all of them, there is an uptrend structure. The opposite order is a downtrend structure. If the lines are tangled around each other, the market is searching for a direction.
If you see a ✕ mark on the chart, that is where the 50-day average crossed the 200-day. A cross from below is called a ‘golden cross’, a cross from above a ‘death cross’. The mark sits at the price level where the two averages meet, not on the candle. These crosses are very well known but they lag: the 200-day average turns very slowly, so by the time the cross appears a significant part of the move has already happened.
How to read it
- Look at the order: EMA20 > EMA50 > SMA200 with price on top is an uptrend structure; the reverse order is a downtrend structure.
- Look at how far price is from the averages: if price has moved far away from EMA20, you may be late for an entry even if the trend is strong.
- In an uptrend structure, moments when price pulls back to EMA20 or EMA50 are commonly used zones for joining the trend.
- Read a golden or death cross not as a starting signal but as a lagging sign confirming that the big picture has changed.
In this state right now
Liquid symbols whose 50-day average has just moved above the 200-day (gap under 1 percent) — a fresh or approaching golden cross.
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We measured
In a buy recipe we measured on BIST we used the averages as a trend filter: pullback turns that came while the 50 average was above the 200 and price was above the 200 (together with other conditions) gave strong, positive results on the 4-hour chart in both halves of the measurement period. The same recipe stayed weak on the 1-hour and daily charts; in other words, whether the filter worked depended on the time frame.
Source: BBL Pine measurement: BIST, 1 hour / 4 hour / 1 day, tested in two separate period halves ·
Trap
The most common mistake is buying right at the top because the trend is strong. The order of the averages says ‘the trend is up’; it does not say ‘this is a good price now’. When price moves far from the averages the order looks perfect but the risk is highest. The second mistake is seeing a golden cross and thinking ‘the rally starts now’; usually the first part of the rally came before the cross.
Tip
If you see an ‘extension’ warning on the analysis card, it means exactly that price has moved far from the averages. In that case the system deliberately softens the signal by one step.
Glossary
- SMA
- Simple moving average: an equally weighted average of the last N closes.
- EMA
- Exponential moving average: an average that gives more weight to recent closes.
- Golden cross
- The 50-day average crossing the 200-day from below.
- Death cross
- The 50-day average crossing the 200-day from above.
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See golden-cross symbols in the screener →For information only, not investment advice.