The Lagging Nature of
Moving Averages
Learn why moving averages are inherently lagging indicators, and what this means for how they should be interpreted.
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This final lesson explores the fundamental lagging characteristic of moving averages, a concept referenced throughout this unit and essential to interpreting any moving average appropriately.
This is general educational content explaining a fundamental characteristic of this indicator type.
Why Moving Averages Are Lagging Indicators
A moving average, by its very construction, is calculated from past price data — whether the equally weighted SMA or the more recent-weighted EMA (covered earlier in this unit). Because it's always based on data that has already occurred, a moving average necessarily reflects where price has been, rather than predicting where it will go next.
How Lag Manifests in Practice
This lagging characteristic means a moving average will generally only clearly reflect a new trend direction sometime after that trend has actually begun, rather than at its very outset. Longer-period moving averages (such as the 200-period, covered earlier in this unit) generally exhibit more lag than shorter-period ones (such as the 20-period), given their more general, longer-term average nature.
Why This Matters for Crossovers Specifically
As covered in the previous lesson, this lag is precisely why crossover signals like the golden cross and death cross are generated after a portion of the underlying price move has often already occurred, rather than at the earliest possible point of a trend change.
Accepting Lag as an Inherent Trade-Off
Rather than viewing lag purely as a flaw, it's more accurately understood as an inherent trade-off of the smoothing process that makes moving averages useful in the first place, as covered in this unit's overview — the same averaging that filters out short-term noise also necessarily means the average responds somewhat after the fact, rather than instantly. This closes out the Moving Averages unit, and the next unit in this group explores the MACD indicator, which is itself built directly from moving averages.
🔖 Summary
Moving averages are inherently lagging indicators, since they're calculated from past price data and therefore reflect where price has been rather than predicting future direction, with longer periods generally lagging more than shorter ones. This lag is best understood as an inherent trade-off of the smoothing process, rather than simply a flaw, closing out this unit before the next unit explores the MACD indicator, which is itself built directly from moving averages.
Frequently Asked Questions
Why are moving averages considered lagging indicators?
Because they're calculated from past price data, they necessarily reflect where price has been rather than predicting where it will go next.
Do longer or shorter period moving averages lag more?
Longer-period moving averages generally exhibit more lag than shorter-period ones, given their more general, longer-term averaging nature.
Why does lag matter specifically for crossovers?
It means crossover signals like the golden cross and death cross are generated after a portion of the underlying price move has often already occurred.
Is lag simply a flaw in moving averages?
It's more accurately understood as an inherent trade-off — the same smoothing that filters out noise also means the average responds somewhat after the fact.
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