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# Moving Average - Zero Lag Exponential (ZLEMA)

## Description

The Zero-Lag Exponential Moving Average is a variation on the Exponential Moving Average. The Zero-Lag keeps the benefit of the heavier weighting of recent values, but attempts to remove lag by subtracting older data to minimize the cumulative effect.

... Courtesy of [FMLabs](http://www.fmlabs.com/reference/default.htm?url=ZeroLagExpMA.htm)

## Syntax

`ZLEMA(int period)`

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

**Returns default value**

`ZLEMA(int period)[int barsAgo]`

`ZLEMA(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                                                          |

## Examples

```csharp
// Prints the current value of a 20 period ZLEMA using default price type
double value = ZLEMA(20)[0];
Print("The current SMA value is " + value.ToString());

// Prints the current value of a 20 period ZLEMA using high price type
double value = ZLEMA(High, 20)[0];
Print("The current ZLEMA value is " + value.ToString());
```

## Source Code

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