# Charts

## Gopalakrishnan Range Index (GAPO)

### Description

Gopalakrishnan Range Index, developed by Jayanthi Gopalakrishnan, attempts to determine the variability of price data based on the log of the price range over a user defined n-periods.

### Formula

$GRI = \frac{log(HighestHigh_{n-periods} - LowestLow_{n-periods})}{log(n-periods)}$