9 and 21 EMA crossover
The 9-bar EMA crossing the 21-bar EMA, a fast pair used on shorter time frames.
What it shows
This pair is faster than the 20 and 50. The 9 follows price closely and the 21 follows it more slowly. Their crossings show when the very recent trend changes relative to the short-term trend.
Because the averages are quick, crossings come often. The cross is a fact about two lines, not a prediction.
How we find it
The same code that draws it on your chart follows these steps, with the same result every time.
- Compute the 9-bar EMA and the 21-bar EMA.
- Mark a cross when the 9 moves from below the 21 to above it, or the reverse.
- Show the date and price of each cross.
- Count crosses in the period shown.
Starting values: Short 9; Long 21; Type EMA. These are proposed and will be tuned on real price data before launch.
How to read it
- The blue line is the 9 and the gold line is the 21.
- Gold dots mark the crosses.
- Many crosses close together means a choppy market.
Status labels you may see
| Label | What it means |
|---|---|
| 9 above 21 | The fast average is above the slow one. |
| 9 below 21 | The fast average is below the slow one. |
| Just crossed | A cross happened in the last 3 bars. |
What cancels it
A cross back the other way ends the state.
What traders check next
- How many crosses happened in the last 30 bars.
- The slope of both lines.
- Whether price is above both.
Limits
- Many false crosses in sideways markets.
- Lags price.
- Fast pairs are noisy.
Try it in forecastviz
- Open any ticker and choose Moving averages → 9 and 21 EMA crossover in the left menu.
- Switch between 3M, 6M to see how the picture changes.
- Compare with 20 and 50 average crossover and Exponential moving average on the same chart.
Questions
Is this better than 20/50?
It is faster, so it reacts earlier and gives more crosses.
Which period is it for?
Shorter time frames: 3M and 6M daily charts.
Related trends
Further reading
- Murphy, Technical Analysis of the Financial Markets
- Kaufman, Trading Systems and Methods
- Achelis, Technical Analysis from A to Z
Educational only. Not financial advice, and not a price forecast. Charts are drawn by code from past price data, which may be delayed.