# Technical Studies Reference

- Technical Studies Reference
- Common Study Inputs (Opens a new page)
- Using Studies (Opens a new page)

### Hurst Bands

This study calculates and displays Hurst Bands for the data specified by the **Input Data** Input. This indicator was developed by Jim Hurst.

Let \(X\) be a random variable denoting the **Input Data**, and let the Inputs **Moving Average Length**, **Inner Band Multiplier**, **Outer Band Multiplier**, and **Extreme Band Multiplier** be denoted as \(n\), \(v_I\), \(v_O\), and \(v_E\), respectively. We denote the Displaced Price at Index \(t\) as \(X^{(D)}_t(X,n)\), and we compute it as follows.

For an explanation of the floor function (\(\left\lfloor{\space\space}\right\rfloor\)), refer to our description here.

There are six **Hurst Bands**: two Inner Bands, two Outer Bands, and two Extreme Bands. These are computed in terms of a Simple Moving Average of the Displaced Price for \(t \geq n + \left\lfloor\frac{n}{2}\right\rfloor\) as follows.

__Top and Bottom Inner Hurst Bands__:

\(\displaystyle{BIB^{(H)}(X,n,v_I) = SMA_t\left(X^{(D)}(X,n),n\right) - \frac{v_I}{100} \cdot SMA_t\left(X^{(D)}(X,n),n\right)}\)

__Top and Bottom Outer Hurst Bands__:

\(\displaystyle{BOB^{(H)}(X,n,v_O) = SMA_t\left(X^{(D)}(X,n),n\right) - \frac{v_O}{100} \cdot SMA_t\left(X^{(D)}(X,n),n\right)}\)

__Top and Bottom Extreme Hurst Bands__:

\(\displaystyle{BEB^{(H)}(X,n,v_E) = SMA_t\left(X^{(D)}(X,n),n\right) - \frac{v_E}{100} \cdot SMA_t\left(X^{(D)}(X,n),n\right)}\)

In addition to these six bands, the moving average \(SMA_t\left(X^{(D)}(X,n),n\right)\) is also displayed.

**Note**: Depending on the setting of the Input **Moving Average Type**, the Simple Moving Averages in the above formulas could be replaced with Exponential Moving Averages, Linear Regression Moving Averages, Weighted Moving Averages, Wilders Moving Averages, Simple Moving Averages - Skip Zeros, or Smoothed Moving Averages.

**Note**: The default settings for the Band Multipliers are \(v_E = 0.05\), \(v_O = 0.025\), and \(v_I = 0.0125\), which are ideal for Intraday charts with time scales up to about 10 minutes. As the time scale increases, the values of these multipliers must be manually increased for best results. For Daily charts, the recommended settings are \(v_E = 4.2\), \(v_O = 2.6\), and \(v_E = 1.6\). The spreadsheet test for this study was done on a Daily chart with these settings.

#### Inputs

#### Spreadsheet

The spreadsheet below contains the formulas for this study in Spreadsheet format. Save this Spreadsheet to the Data Files Folder.

Open it through **File >> Open Spreadsheet**.

*Last modified Wednesday, 19th June, 2019.