Forex encyclopedia

Williams' Percent Range is a technical indicator of oscillator type showing overbought/oversold status on market. The first time it was described in 1973 by a famous trader Larry Williams. The indicator itself is very close to Stochastic Oscillator, but unlike Stochastic, WPR is not smoothed over with the help of moving average and has a reverse sale in order to not deprive sense of overbought (at the top) and oversold (downwards) zones.

Parabolic SAR is the technical indicator developed by Welles Wilder for analyzing trend movements. The first time it was announced in a famous book “ New Concepts in Technical Trading Systems” published in 1976. SAR stands for as “stop and reverse”. Parabolic SAR is one of a few indicators that signalize about closing of positions. In many respects Parabolic is similar to a moving average with the only difference that SAR can change position against price. Under ascending tendency, the indicator is drawn under prices (candles, bars), under descending tendency it is put above prices. When price crosses Parabolic line, reversal of the indicator takes place.