variance
Statistical Variance
variance(source, period)
Parameters
| Name | Type | Description |
|---|---|---|
source |
field | Data series |
period |
int | Number of periods |
Formula
```
Variance = Σ(x - mean)² / N
stdev = sqrt(variance)
Uses population variance
```Examples
// variance expanding (volatility increasing)
x = variance(close, 20); x > x[20];
// low variance environment (consolidation)
variance(close, 20) < 4;Returns
Non-negative float (squared units) ## See Also stdev