**AroonUp.efs**

**File Name: **AroonUp.efs**Description: **

Aroon Up

**Formula Parameters:**

*Length*: 14

**Notes: **

This formula is one of the components of the Aroon and Aroon Oscillator indicators.

Developed by Tushar Chande in 1995, the Aroon is an indicator system that can be used to determine whether a stock is trending or not and how strong the trend is. "Aroon" means "Dawn's Early Light" in Sanskrit and Chande choose that name for this indicator since it is designed to reveal the beginning of a new trend.

The Aroon indicator consists of two lines, Aroon(up) and Aroon(down).

The Aroon Oscillator is a single line that is defined as the difference between Aroon(up) and Aroon(down). All three take a single parameter which is the number of time periods to use in the calculation. Since Aroon(up) and Aroon(down) both oscillate between 0 and +100, the Aroon Oscillator ranges from -100 to +100 with zero serving as the crossover line.

AroonUp indicator is calculated according to formula:

AroonUp = 100 * (Period - PeriodHigh) / Period where PeriodHigh = Number of bars since highest high of the Period AroonUp for a given time period is calculated by determining how much time (on a percentage basis) elapsed between the start of the time period and the point at which the highest closing price during that time period occurred. When the stock is setting new highs for the time period, AroonUp will be 100. If the stock has moved higher every day during the time period, AroonUp will be zero.

**Download File: **

AroonUp.efs**EFS Code:**

/********************************* Provided By: Interactive Data Corporation (Copyright © eSignal) 2010. All rights reserved. This sample eSignal Formula Script (EFS) is for educational purposes only. Interactive Data Corporation reserves the right to modify and overwrite this EFS file with each new release. Description: AroonUp Version: 1.0 05/14/2009 Formula Parameters: Default: Length 14 Notes: This formula is one of the components of the Aroon and Aroon Oscillator indicators. Developed by Tushar Chande in 1995, the Aroon is an indicator system that can be used to determine whether a stock is trending or not and how strong the trend is. "Aroon" means "Dawn's Early Light" in Sanskrit and Chande choose that name for this indicator since it is designed to reveal the beginning of a new trend. The Aroon indicator consists of two lines, Aroon(up) and Aroon(down). The Aroon Oscillator is a single line that is defined as the difference between Aroon(up) and Aroon(down). All three take a single parameter which is the number of time periods to use in the calculation. Since Aroon(up) and Aroon(down) both oscillate between 0 and +100, the Aroon Oscillator ranges from -100 to +100 with zero serving as the crossover line. AroonUp indicator is calculated according to formula: AroonUp = 100 * (Period - PeriodHigh) / Period where PeriodHigh = Number of bars since highest high of the Period AroonUp for a given time period is calculated by determining how much time (on a percentage basis) elapsed between the start of the time period and the point at which the highest closing price during that time period occurred. When the stock is setting new highs for the time period, AroonUp will be 100. If the stock has moved higher every day during the time period, AroonUp will be zero. **********************************/ function preMain() { setStudyTitle("Aroon Up"); setCursorLabelName("ArnUp", 0); setDefaultBarFgColor(Color.RGB(0xFE,0x69,0x00), 0); var fp1 = new FunctionParameter("nInputPeriod", FunctionParameter.NUMBER); fp1.setName("Length"); fp1.setLowerLimit(1); fp1.setDefault(14); } var bInit = null; var AryClose; function main(nInputPeriod){ var vState = getBarState(); if (vState == BARSTATE_ALLBARS || bInit == false){ AryClose = new Array(nInputPeriod+1); bInit = true; } if (vState == BARSTATE_NEWBAR) { AryClose.pop(); AryClose.unshift(high(0)); } else { AryClose[0] = high(0); } if (AryClose[AryClose.length-1] == null) return; var vIndex = findHighIndex(AryClose); return ((nInputPeriod-vIndex)/nInputPeriod)*100; } function findHighIndex(AryIn){ var vHighIndex = 0; var vHigh = 0.0; vHigh = AryIn[0]; for(var i = 1; i < AryIn.length; i++){ if (vHigh < AryIn[i]) { vHigh = AryIn[i]; vHighIndex = i; } } return vHighIndex; }