Moving Average Pullbacks and BIAS
In an uptrend, a dip to a rising moving average that then holds is often used as a chance to join the trend; when price gets too far from the average, it tends to fall back.
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Text version · Trend Indicators, lesson 10: “Moving Average Pullbacks and BIAS”
In an uptrend, a dip to a rising moving average that then holds is often used as a chance to join the trend; when price gets too far from the average, it tends to fall back.
Wait for price to come back and touch the average
In an uptrend, when price dips to a rising moving average and still closes above it, that's a pullback. The upside is that the risk is clear: a break below the average or the pullback low tells you you're wrong.
Too far from the average, prone to snapping back
BIAS is how far price is from a moving average, in percent. A large BIAS means the short-term move was too fast, making a return toward the average more likely; but in a strong trend, BIAS can stay stretched for a long time.
Trend first, then pullbacks
When the average is flat, touching it is just part of crossing back and forth; when it's falling, bounces to the average are more likely to be rejected. Pullbacks only mean something when the average is rising.
Key takeaways
- Pullback: in an uptrend, price dips to an upward-sloping moving average and still closes above it. It gives you an entry with clear risk: if it breaks, you exit.
- When the average is flat or falling, "buy the pullback" loses its basis. Confirm the trend first, then look for pullbacks.
- BIAS = how far price is from the average, in percent. A big gap means the move has run too fast and a return toward the average becomes more likely, but in a strong trend the gap can persist for a long time.
Try it yourself
You can do these exercises in this lesson's interactive simulation:
- Keep "Uptrend" and MA20, and hover over a green "Pullback" marker: according to the explanation card, how much did price move 10 bars after that pullback?
- Look at the BIAS panel below: in the uptrend, after BIAS shoots past the +8% alert line, does it return to around 0 right away or stay high for a while? This shows a big BIAS doesn't mean an immediate pullback.
- Switch to "Sideways range": what does "MA direction" show? How does "Avg. 10 bars after pullback" compare with the uptrend?
- Go back to "Uptrend" and drag "MA period" from 20 to 10, then to 50: how does the number of pullbacks change? Why are there fewer pullbacks with a longer period?
Quiz and explanations
- 1. The close is 110 and the MA20 is 100. What's the BIAS?
- Answer: +10%.(110 − 100) ÷ 100 = +10%.
- 2. In an uptrend, price dips to a rising MA20 and closes back above it. What's a sensible plan?
- Answer: Consider joining the trend, with a stop below the pullback low or the average.A pullback gives you a spot where you'll quickly know if you're wrong, not a guarantee of a rally.
- 3. The moving average is flat and price keeps crossing above and below it. How well does "buy every pullback" work now?
- Answer: Poorly, because there's no trend to follow.Pullbacks only make sense in a trend. In a range, touching the average is just part of the back-and-forth.
Terms in this lesson
- BIAS: How far the close is from a moving average, in percent; a big gap means a move has run too fast and is more likely to return to the average, though it can persist in a strong trend.
- pullback (Pullback): In an uptrend, price dips to a rising moving average or support and then holds, often used as a chance to join the trend.