QuanTAlib/lib/volume/_index.md

# Volume

> "It takes volume to make prices move." — Charles Dow

Volume is market fuel. Price tells what happened; volume tells how hard the market worked to make it happen. In a world of algorithmic trading and dark pools, volume analysis reveals where money actually flows.

| Indicator | Full Name | Description |
| :--- | :--- | :--- |
| [ADL](adl/Adl.md) | Accumulation/Distribution Line | Correlates price location within range to volume. Grandfather of volume flow analysis. |
| [ADOSC](adosc/Adosc.md) | Chaikin A/D Oscillator | Momentum indicator for AD Line. Predicts reversals by measuring acceleration of money flow. |
| [AOBV](aobv/Aobv.md) | Archer On-Balance Volume | Dual EMA smoothing of OBV for cleaner crossover signals. |
| [CMF](cmf/Cmf.md) | Chaikin Money Flow | Measures money flow volume over set period (typically 20-21 days). |
| [EFI](efi/Efi.md) | Elder's Force Index | Combines price movement, direction, volume to measure buying/selling power. |
| [EOM](eom/Eom.md) | Ease of Movement | Relates price change to volume. Highlights periods of effortless price movement. |
| [EVWMA](evwma/Evwma.md) | Elastic Volume Weighted MA | Volume-adaptive moving average where volume directly controls smoothing weight per bar. |
| [III](iii/Iii.md) | Intraday Intensity Index | Measures buying/selling pressure within day's range using close position. |
| [KVO](kvo/Kvo.md) | Klinger Volume Oscillator | Compares short-term and long-term volume trends to identify potential reversals. |
| [MFI](mfi/Mfi.md) | Money Flow Index | Volume-weighted RSI. Measures buying/selling pressure using price and volume. |
| [NVI](nvi/Nvi.md) | Negative Volume Index | Tracks price changes on lower volume days. Assumes smart money acts on quiet days. |
| [OBV](obv/Obv.md) | On Balance Volume | Fundamental volume indicator. Cumulative volume based on price direction. |
| [PVD](pvd/Pvd.md) | Price Volume Divergence | Systematic divergence detection between price and volume movements. |
| [PVI](pvi/Pvi.md) | Positive Volume Index | Tracks price changes on higher volume days. Assumes crowd behavior. |
| [PVO](pvo/Pvo.md) | Percentage Volume Oscillator | Compares short-term and long-term volume moving averages as percentages. |
| [PVR](pvr/Pvr.md) | Price Volume Rank | Categorical indicator returning 0-4 based on combined price and volume direction. |
| [PVT](pvt/Pvt.md) | Price Volume Trend | Cumulative volume adjusted by relative price changes. Similar to OBV but magnitude-weighted. |
| [TVI](tvi/Tvi.md) | Trade Volume Index | Cumulative volume with sticky direction based on minimum tick threshold. Filters noise from OBV. |
| [TWAP](twap/Twap.md) | Time Weighted Average Price | Average price weighted equally by time. Used as execution benchmark. |
| [VA](va/Va.md) | Volume Accumulation | Cumulative volume adjusted by close position relative to range midpoint. |
| [VF](vf/Vf.md) | Volume Force | Measures force of volume behind price movements using EMA smoothing. |
| [VO](vo/Vo.md) | Volume Oscillator | Difference between short and long volume moving averages. Shows volume momentum. |
| [VROC](vroc/Vroc.md) | Volume Rate of Change | Measures speed at which volume is changing over time. |
| [VWAD](vwad/Vwad.md) | Volume Weighted A/D | Similar to ADL but weights accumulation/distribution by volume. |
| [VWAP](vwap/Vwap.md) | Volume Weighted Average Price | Average price weighted by volume. Common execution benchmark and intraday reference. |
| [VWMA](vwma/Vwma.md) | Volume Weighted Moving Average | Moving average where each price point is weighted by its volume over a sliding window. |
| [WAD](wad/Wad.md) | Williams Accumulation/Distribution | Measures cumulative buying/selling pressure using True Range and volume. |
| MARKETFI | Market Facilitation Index | (High − Low) / Volume. Measures price efficiency per unit volume. |