---
title: tripleEMA() function
description: >
  `tripleEMA()` returns the triple exponential moving average (TEMA) of values in
  the `_value` column.
menu:
  flux_v0_ref:
    name: tripleEMA
    parent: universe
    identifier: universe/tripleEMA
weight: 101
flux/v0/tags: [transformations]
introduced: 0.38.0
---

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`tripleEMA()` returns the triple exponential moving average (TEMA) of values in
the `_value` column.

`tripleEMA` uses `n` number of points to calculate the TEMA, giving more
weight to recent data with less lag than `exponentialMovingAverage()` and
`doubleEMA()`.

#### Triple exponential moving average rules
- A triple exponential moving average is defined as `tripleEMA = (3 * EMA_1) - (3 * EMA_2) + EMA_3`.
    - `EMA_1` is the exponential moving average of the original data.
    - `EMA_2` is the exponential moving average of `EMA_1`.
    - `EMA_3` is the exponential moving average of `EMA_2`.
- A true triple exponential moving average requires at least requires at least
  `3 * n - 2` values. If not enough values exist to calculate the TEMA, it
  returns a `NaN` value.
- `tripleEMA()` inherits all `exponentialMovingAverage()` rules.

##### Function type signature

```js
(<-tables: stream[{A with _value: B}], n: int) => stream[C] where B: Numeric, C: Record
```

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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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## Parameters

### n
({{< req >}})
Number of points to use in the calculation.



### tables

Input data. Default is piped-forward data (`<-`).




## Examples

### Calculate a three point triple exponential moving average

```js
import "sampledata"

sampledata.int()
    |> tripleEMA(n: 3)

```

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#### Input data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 10      | t1   |
| 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:30Z | 17      | t1   |
| 2021-01-01T00:00:40Z | 15      | t1   |
| 2021-01-01T00:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:40Z | 13      | t2   |
| 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| _time                | _value             | *tag |
| -------------------- | ------------------ | ---- |
| 2021-01-01T00:00:50Z | 7.6250000000000036 | t1   |

| _time                | _value             | *tag |
| -------------------- | ------------------ | ---- |
| 2021-01-01T00:00:50Z | 4.0729166666666625 | t2   |

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