# Technical Studies Reference

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

### Chikou Span

Calculates and displays a Chikou Span (aka Lagging Span) of the data specified by the **Input Data** Input.

Let \(X\) be a random variable denoting the **Input Data**, and let \(X_t\) be the value of the **Input Data** at Index \(t\). Let the Input **Chikou Span Length** be denoted as \(n\). Let \(i\) denote a value of the Index between \(0\) and the current Index \(t\). Then we denote the **Chikou Span** at Index \(i\) for the given Inputs as \(CS_i(X,n)\), and we compute it as follows.

This is equivalent to the following, more intuitive, formula.

\(\displaystyle{CS_i(X,n) = \left\{ \begin{matrix} X_{i + n} & 0 \leq i \leq t - n \\ 0 & t - n < i \leq t \end{matrix}\right .}\)#### 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 Friday, 05th January, 2018.