what is the vortex indicator vi 
a vortex indicator vi is an indicator composed of two lines an uptrend line vi and a downtrend line vi these lines are typically colored green and red respectively a vortex indicator is used to spot trend reversals and confirm current trends understanding vortex indicator vi the vortex indicator was first developed by etienne botes and douglas siepman who introduced the concept in a 2009 edition of technical analysis of stocks commodities the vortex indicator is based on two trendlines vi and vi vortex indicator calculationsthe calculation for the indicator is divided into four parts 1 true range tr is the greatest of 2 uptrend and downtrend movement 3 parameter length n 4 create the trendlines vi and vi the traditional application of using vi and vi crossovers can result in a number of false trade signals when price action is choppy increase the number of periods used in the indicator to reduce this for example using 25 periods instead of 14 inferencesthe vortex indicator is commonly used in conjunction with other reversal trend patterns to help support a reversal signal it is integrated into most technical analysis software programs vi and vi are typically graphed independently below a candlestick chart the chart below provides an example with lines that indicate changing trend signals on a candlestick chart an uptrend or buy signal occurs when vi is below vi and then crosses above vi to take the top position among the trendlines a downtrend or sell signal occurs when vi is below vi and crosses above vi to take the top position among the trendlines overall the trendline in the top position generally dictates whether the security is in an uptrend or downtrend 