Concept

Elder Impulse System

Elder Impulse System is a Momentum & Oscillators concept. The Library holds 1 implementation — a working definition you can pull into Quant.

The standard Elder Impulse System indicator

Elder Impulse System exactly as classically defined — the faithful reference build of the original formula, free to run in Quant.

Elder Impulse System preview

Elder Impulse System

Indicator

What is the Elder Impulse System?

The Elder Impulse System is a bar-coloring method from Alexander Elder that combines one trend input and one momentum input. Each bar is colored by the slope of an exponential moving average (commonly 13-period) and the slope of the MACD histogram: green when both are rising, red when both are falling, and blue (neutral) when the two disagree.

Elder introduced the system in Come Into My Trading Room (2002), and it is now widely available in charting platforms and community scripts, usually applied as a paint over the price bars rather than as a separate pane. The logic is deliberately minimal: the EMA slope answers whether the market's inertia points up or down, the histogram slope answers whether momentum is building or fading, and requiring agreement compresses two continuous indicators into three discrete states.

Elder described it as a censorship system rather than a signal generator: it tells you what you may not do. Green bars forbid shorting, red bars forbid buying, and blue bars permit either side or standing aside. In his triple-screen approach the impulse color on a higher timeframe gates which direction may be traded on the lower one, making it a permission filter applied from above rather than an entry technique.

The design addresses the most common failure of momentum tools used alone: an oscillator such as the stochastic oscillator or RSI can flash oversold repeatedly while a downtrend grinds on. By insisting that trend and momentum agree before a side of the market is even allowed, the impulse system forces counter-trend ideas to wait until the pressure against them stops worsening, without claiming to predict the next bar.

How to identify the Elder Impulse System on a chart

The impulse system is applied rather than spotted, but reading it correctly requires knowing exactly what each color encodes.

  1. 1Load an Elder Impulse script or built-in bar paint; every price bar turns green, red, or blue.
  2. 2Verify the inputs: the classic build compares the current bar's 13-period EMA against the prior bar's, and the current MACD histogram (12, 26, 9) against the prior one.
  3. 3Read green as both slopes rising, red as both falling, and blue as disagreement between the two.
  4. 4Track sequences rather than single bars: red fading to blue and then green is the classic bottoming progression, while an isolated flip inside chop means little.
  5. 5For Elder's intended use, check the color on the timeframe above your trading timeframe first, since that one does the censoring.

How it's calculated

Colors each bar by whether the 13-period EMA slope (trend) and the MACD histogram slope (momentum) agree.

EMA⁡n(t)=α×Ct+(1−α)×EMA⁡n(t−1),α=2n+1\operatorname{EMA}_n(t) = \alpha \times C_t + (1 - \alpha) \times \operatorname{EMA}_n(t - 1), \quad \alpha = \frac{2}{n + 1}
MACD⁡t=EMA⁡12(t)−EMA⁡26(t)\operatorname{MACD}_t = \operatorname{EMA}_{12}(t) - \operatorname{EMA}_{26}(t)
Signal⁡t=EMA⁡9(MACD⁡)\operatorname{Signal}_t = \operatorname{EMA}_9(\operatorname{MACD})
Hist⁡t=MACD⁡t−Signal⁡t\operatorname{Hist}_t = \operatorname{MACD}_t - \operatorname{Signal}_t
Green bar: EMA⁡13(t)>EMA⁡13(t−1) and Hist⁡t>Hist⁡t−1\text{Green bar: } \operatorname{EMA}_{13}(t) > \operatorname{EMA}_{13}(t - 1) \text{ and } \operatorname{Hist}_t > \operatorname{Hist}_{t-1}
Red bar: EMA⁡13(t)<EMA⁡13(t−1) and Hist⁡t<Hist⁡t−1\text{Red bar: } \operatorname{EMA}_{13}(t) < \operatorname{EMA}_{13}(t - 1) \text{ and } \operatorname{Hist}_t < \operatorname{Hist}_{t-1}
Blue bar: any other combination\text{Blue bar: any other combination}
EMA_n: exponential moving average with period n, applied to close except the signal line, which smooths the MACD series
α: EMA smoothing factor
C_t: close of bar t
MACD_t: MACD line at bar t (defaults 12 and 26)
Signal_t: signal line, the 9-period EMA of the MACD line (default 9)
Hist_t: MACD histogram at bar t
EMA_13: trend EMA of close (default 13)
n: EMA period
t: current bar index

Elder treats it as a censorship rule: green forbids new shorts, red forbids new longs, blue leaves both sides available.

Defaults are a 13-period EMA with the 12-26-9 MACD histogram; Elder reads the color on a longer timeframe as well as the trading timeframe, in the spirit of his triple screen method.

How traders use it

  • As a trade censor: long entries are considered only while the impulse is green and shorts only while it is red, with blue treated as unrestricted or as a stand-aside state depending on the plan.
  • As a timing cue: the color flip out of red or blue into green after a pullback is a common continuation prompt, still requiring its own entry trigger and exit rules.
  • As a multi-timeframe gate: weekly impulse color restricts daily trades, or daily restricts intraday, following Elder's original triple-screen usage.
  • Combined with divergence work: community scripts overlay regular bullish/bearish divergence detection on the MACD histogram, so the divergence sets up the idea and the impulse color flip times the entry.
  • As an exit manager: a long held through green bars is tightened or partially closed when the color degrades to blue, and many plans treat a full flip to red as a hard exit.
  • As a scan filter: screening a watchlist by weekly impulse color sorts symbols into long-only, short-only, and unrestricted groups before detailed chart work begins.

Elder Impulse System vs related momentum tools

MACD: The impulse system consumes only the MACD histogram's bar-to-bar slope and discards its level, its lines, and its crossovers. MACD proper offers magnitude and divergence information that the impulse deliberately trades away for a simple three-state answer.

Momentum: A raw momentum line measures the speed of price change as a continuous, unbounded series the trader must interpret. The impulse system pre-interprets: it reduces trend plus momentum agreement to green, red, or blue and asks for no further reading.

Stochastic Oscillator: The stochastic locates the close within its recent range to flag overbought and oversold turns, a mean-reversion instinct. The impulse system is the opposite temperament: it exists to keep the trader aligned with the prevailing pressure, not fading it.

Concept family

Momentum & Oscillators

91 concepts mapped · 91 in the Library

Elder Impulse System FAQ

What do the Elder Impulse colors mean?

Green means the 13-period EMA and the MACD histogram are both rising, so trend and momentum agree upward; red means both are falling; blue means they disagree. Elder's reading is prohibitive: green bars ban shorts, red bars ban longs, blue bars ban nothing. The colors describe the current bar's inertia, not a prediction of the next one.

Is the Elder Impulse System a complete trading system?

No. Elder designed it to restrict trades, not to generate them: it removes one side of the market from consideration and leaves entries, exits, and risk to other tools. Used alone it flips colors frequently in choppy conditions, so most implementations pair it with support/resistance or pattern-based entries and a separate stop methodology.

What settings does the Elder Impulse System use?

The standard build is a 13-period EMA for trend and the 12-26-9 MACD histogram for momentum, matching Elder's published defaults. Both are conventions rather than optimized values, and traders who adjust the lengths keep the structure of one trend slope plus one momentum slope intact.

Which timeframes does the Elder Impulse System work on?

The construction works on any timeframe. Elder's own usage is multi-timeframe: pick a trading timeframe, then apply the impulse one step higher, weekly to gate daily trades or daily to gate intraday ones. On a single fast chart in a ranging market the colors flip constantly and the censorship value largely disappears.

Can the Elder Impulse System be used with RSI or other oscillators?

Yes, and that is close to the intended design: the impulse decides which side is permitted and a separate tool supplies the entry. Pullback readings on oscillators such as the stochastic RSI or CCI are common triggers, taken only in the impulse-approved direction.

What should you do on blue bars?

Blue means the EMA slope and the histogram slope disagree, so the system censors nothing. Elder treats blue as freedom rather than signal: positions may be held with tightened risk, new entries in either direction are allowed but unendorsed, and many traders simply stand aside until agreement returns.

Turn Elder Impulse System into a trading strategy.

Take the implementation from this page into Quant, then build on it, backtest it on real data, and keep refining it with AI.