# Volatility Indicator Functions
### ATR - Average True Range
```
real = ATR(high, low, close, timeperiod=14)
```

Learn more about the Average True Range at [tadoc.org](http://www.tadoc.org/indicator/ATR.htm).  
### NATR - Normalized Average True Range
```
real = NATR(high, low, close, timeperiod=14)
```

Learn more about the Normalized Average True Range at [tadoc.org](http://www.tadoc.org/indicator/NATR.htm).  
### TRANGE - True Range
```
real = TRANGE(high, low, close)
```

Learn more about the True Range at [tadoc.org](http://www.tadoc.org/indicator/TRANGE.htm).  

[Documentation Index](../doc_index.html)
[FLOAT_RIGHTAll Function Groups](../funcs.html)
