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64 lines
2.7 KiB
Markdown
64 lines
2.7 KiB
Markdown
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# ADOSC: Chaikin A/D Oscillator
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> "Momentum precedes price. Volume momentum precedes price momentum."
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The Chaikin Oscillator (ADOSC) is an indicator of an indicator. It applies the MACD formula to the Accumulation/Distribution Line (ADL) instead of the price.
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While the ADL is great for spotting long-term flow, it can be sluggish. ADOSC acts as a turbocharger, measuring the *momentum* of that flow. It anticipates changes in the ADL, often signaling a reversal before the ADL itself turns.
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## Historical Context
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Marc Chaikin created this oscillator because he found the standard ADL too slow for timing entries. He realized that applying the moving average convergence/divergence (MACD) logic to the ADL would highlight the acceleration and deceleration of buying pressure.
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## Architecture & Physics
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ADOSC is a derivative indicator. It depends on:
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1. **ADL**: The base volume flow metric.
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2. **EMA**: Two exponential moving averages of that metric.
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The physics here is identical to MACD:
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- **Fast EMA (3)**: Represents the immediate, short-term money flow.
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- **Slow EMA (10)**: Represents the established, medium-term money flow.
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- **Difference**: The spread between them represents the momentum of accumulation.
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### Zero-Allocation Design
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Our implementation composes existing zero-allocation components (`Adl` and `Ema`). The `Update` method simply pipes the bar into the ADL, and the ADL result into the two EMAs.
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## Mathematical Foundation
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$$
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ADOSC_t = EMA(ADL, 3)_t - EMA(ADL, 10)_t
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$$
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Where:
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- $ADL$ is the Accumulation/Distribution Line.
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- $EMA(X, N)$ is the Exponential Moving Average of X over N periods.
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## Performance Profile
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ADOSC is slightly heavier than ADL because it involves two EMAs.
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| Metric | Complexity | Notes |
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| :--- | :--- | :--- |
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| **Throughput** | ~15ns / bar | 1 ADL update + 2 EMA updates |
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| **Allocations** | 0 bytes | Hot path is allocation-free |
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| **Complexity** | O(1) | Constant time per update |
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| **Precision** | `double` | Required for EMA convergence |
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## Validation
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We validate against **TA-Lib**, **Skender.Stock.Indicators**, and **OoplesFinance**.
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- **Accuracy**: Matches external libraries to 9 decimal places.
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- **Note**: Tulip's `adosc` implementation diverges significantly from other libraries and is excluded from validation.
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### Common Pitfalls
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- **Volatility**: ADOSC is extremely volatile. It whipsaws frequently. It should never be used in isolation.
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- **Trend Confirmation**: Use it to confirm a trend, not to predict it. If price is rising but ADOSC is falling (divergence), the rally is running on fumes.
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- **Zero Line**: Crosses above zero indicate that short-term accumulation is overpowering long-term accumulation (Bullish). Crosses below zero indicate the opposite (Bearish).
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