# Force index

`force`

Volume times the change of a moving average of price.

## Inputs

| Name | Type | Default | Range |
| --- | --- | --- | --- |
| source | source | close |  |
| period | int | 13 | 1 to 5000 |
| method | ma_method | sma |  |
| volume | volume | tick |  |

## Outputs

| Name | Kind |
| --- | --- |
| force | value |

Warm-up: period bars (13 at the defaults).

Repaints: No.

## Formula

force = volume[i] * (MA[i] - MA[i-1]) with the moving average of the chosen method