PercentR (Function)

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The PercentR function evaluates the price range over Length number of bars. It then returns a percentage of where the current price lies, related to the evaluated trading range.

Syntax

PercentR(Length)

Returns (Double)

A numeric value containing the current %R value.

Parameters

Name	Type	Description
Length	Numeric	Sets the number of bars to consider in the calculation of PercentR.

Remarks

The formula used to calculate the Percentage Range follows:

%R=100*((Hr-C)/(Hr-Lr))

…where

r = The time period selected

Hr = The highest High of that period

Lr = The lowest Low of that period

C = Today’s Close

The input Length can be hard coded with a whole number or can be replaced by a numeric simple input whose default value is a whole number.

Example

Plots the PercentR over a length of 10 bars.

Plot1(PercentR(10);

Reference

Williams, Larry. How I Made One Million Dollars Last Year Trading Commodities. Monterey, California: Conceptual Management, 1973 2nd edition.

To be consistent with other oscillators, PercentR takes William’s value and subtracts it from one hundred (100). For example, if William’s Percent R returns -80, PercentR will return 20.