Forex encyclopedia

Moving Average Envelope is a technical indicator consisting of two moving averages shifted up and down for a certain percentage. Deviation is measured from central moving average that can be put on chart. This indicator is mainly used to define borders of current price movement or as oversold/overbought indicator, when under the pressure of bears or bulls prices reach extremes. Also envelopes are good in showing market phase – under trend or flat. This figure is very similar to another equally well-know technical instrument Bollinger Bands, BB.
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.
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