// Volatility Ratio (Schwager)
//
// https://www.investopedia.com/terms/v/volatility-ratio.asp
// https://www.incrediblecharts.com/indicators/volatility_ratio_schwager.php
//
// What is Volatility Ratio
//
// The volatility ratio is a technical measure used to identify price patterns and breakouts. In technical analysis it uses true range to gain an understanding of how a 
// security’s price is moving on the current day in comparison to its past volatility.
//
// BREAKING DOWN Volatility Ratio
//
// The volatility ratio is a measure that helps investors follow the volatility of a stock’s price. It is one of a few technical indicators focused on volatility. In general, 
// standard deviation is typically one of the most common measures used for following volatility. Standard deviation forms the basis for several technical channels including 
// Bollinger Bands. Comprehensively envelope channels of many different varieties are used by technical analysts to identify price ranges and volatility patterns that help lead 
// to trading signals. Historical volatility is also another common trendline that can be used to follow volatility.
//
// The volatility ratio was developed to contribute to the analysis of price volatility. Across the industry volatility and volatility ratio calculations may vary. For technical 
// analysis, Jack Schwager is known for introducing the concept of a volatility ratio in his book “Technical Analysis.”
//
// Calculating the Volatility Ratio
//
// Schwager’s methodology for calculating the volatility ratio builds on the concept of true range which was developed and introduced by Welles Wilder but has several iterations. 
//
//                  VR = TTR / ATR
//
//                  where:   VR                 = Volatility Ratio
//                           TTR                = Today’s True Range
//                           Today’s True Range = Max − Min
//                           Max                = Today’s High, Yesterday’s Close
//                           Min                = Today’s Low, Yesterday’s Close
//                           ATR                = Average True Range of the Past N-Day Period​
//
DEFPARAM CalculateOnLastBars = 1000
//Periods    = 20
//AvgT       = 0
Periods      = max(1,min(999,Periods))
AvgT         = max(0,min(6,AvgT))
MyTR1        = high - low
MyTR2        = high - close[1]
MyTR3        = close[1] - low
MyTrueRange  = max(MyTR1,max(MyTR2,MyTR3))
VolatilRatio = average[Periods,AvgT](MyTrueRange)
RETURN VolatilRatio AS "Volatility Ratio (Schwager)"