# Linear weighted moving average

`wma`

Average that weights the newest value N times and the oldest once.

## Inputs

| Name | Type | Default | Range |
| --- | --- | --- | --- |
| source | source | close |  |
| period | int | 13 | 1 to 5000 |

## Outputs

| Name | Kind |
| --- | --- |
| wma | value |

Warm-up: period - 1 bars (12 at the defaults).

Repaints: No.

## Formula

WMA[i] = (period * x[i] + (period - 1) * x[i-1] + ... + 1 * x[i-period+1]) / (period * (period + 1) / 2)

No value until period bars exist. A window holding a missing value has no value.