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# Volume Moving Average (VOLMA)

## Description

The Volume Moving Average indicator is an indicator on indicator implementation. It calculates and returns the value of an [exponential moving average](/developer/desktop-sdk/references/common/system-indicator-methods/moving-average-exponential-ema) of [volume](/developer/desktop-sdk/references/common/system-indicator-methods/volume).

## Syntax

`VOLMA(int period)`

`VOLMA(ISeries\<double\> input, int period)`

**Returns default value**

`VOLMA[int period] (int barsAgo)`

`VOLMA[ISeries\<double\> input, int period] (int barsAgo)`

## Return Value

**double**; Accessing this method via an index value `[int barsAgo]` returns the indicator value of the referenced bar.

## Parameters

| Parameter | Description                                                                                     |
| --------- | ----------------------------------------------------------------------------------------------- |
| input     | Indicator source data ([Series\<T>](/developer/desktop-sdk/references/common/iseriest/seriest)) |
| period    | Number of bars used in the calculation                                                          |

## Example

```csharp
// Evaluates if the current volume is greater than the 20 period EMA of volume  
if (Volume[0] > VOLMA(20)[0])  
  Print("Volume has risen above its 20 period average");
```

## Source Code

You can view this indicator method source code by selecting the menu New > NinjaScript Editor > Indicators within the NinjaTrader Control Center window.