change

Change (Difference from historical value)

`change(source, length)`

Parameters

Name	Type	Description
`source`	field	Data series
`length`	int	Periods to look back

Formula

```
change = source - source[length]
```

Examples

change(close, 1) > 0;               // positive gain from prior bar
change(high, 5); < 0                // lower high from 5 bars ago
change(volume, 10) >= volume[10];   // volume more than doubled from 10 bars ago

Returns

Float (positive = increase, negative = decrease)

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