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Random article: Zig-Zag indicator
Zig-Zag indicator is a famous indicator (overlapping) represented by lines that connect extreme prices (minimum and maximum).  Zig-Zag measures price changes as percentage and ignores those does not matching certain criterion. In other words, Zig-Zag is a price filter of a particular kind, because it is able to filter insignificant fluctuations of price. Until change for a scheduled percentage takes place, the line moves along with price. When price changes for the value beyond scheduled value , the line takes a reversal into another side. Thus, chart price is formed by curves (zig zag).
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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