The Parabolic SAR is a technical indicator invented by the famous technical analyst, J. Welles Wilder. It was first presented at the popular book, New Concepts in Technical Analysis (1978) and is included in almost all trading platforms. Its main feature is that is takes time into account in calculation – which was a revolutionary concept at that time.
Read more here:
http://forex-indicators.org/2009/10/10/how-to-trade-parabolic-sar-indicator/
Read more here:
http://forex-indicators.org/2009/10/10/how-to-trade-parabolic-sar-indicator/