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# Technical Studies Reference

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### Percent Change Since Previous Close

The study calculates and displays the Percent Change Since Previous Close of the data specified by the **Input Data** Input.

Let \(X\) be a random variable denoting the **Input Data**, and let \(X_t\) be its value at Index \(t\), and let \(v\) be the **Multiplier** Input. The **Percent Change Since Previous Close** at Index \(t\) is denoted as \(\%\Delta X^{(PC)}_t\), and we compute it as follows.

__For Historical Charts__:

__For Intraday Charts__:

**Note:** This formula only give a true Percent Change if the **Multiplier Input** is set to \(100\).

\(t_{start}\) is determined as follows.

- For the first day in the chart, \(t_{start} = 0\), which is the Index of the first bar in the chart.
- For the first bar in each subsequent day in the chart, \(t_{start}\) is the Index of the final bar of the previous day in the chart.

More detailed information about how the time of the Closing bar of the previous trading day is determined can be found in the section on Session Times.

#### 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 Thursday, 12th November, 2020.