Trading on Cryptocurrency Bitcoin/Etherium with Parabolic SAR Indicator
The Parabolic SAR is a technical indicator that is used by many traders to determine the direction of an asset's momentum and the point in time when this momentum has a higher-than-normal probability of switching directions. Sometimes known as the "stop and reversal system", The Parabolic SAR was developed by the famous technician Welles Wilder, creator of the relative strength index, and it is shown as a series of dots placed either above or below an asset's price on a chart.
One of the most important aspects to keep in mind is that the positioning of the "dots" is used by traders to generate transaction signals depending on where the dot is placed relative to the asset's price. A dot placed below the price is deemed to be a bullish signal, causing traders to expect the momentum to remain in the upward direction. Conversely, a dot placed above the prices is used to illustrate that the bears are in control and that the momentum is likely to remain downward.
Calculation of SAR is complex with if/then variables that make it difficult to put in a spreadsheet. These examples will provide a general idea of how SAR is calculated. Because the formulas for rising and falling SAR are different, it is easier to divide the calculation into two parts. The first calculation covers rising SAR and the second covers falling SAR.
Prior SAR: The SAR value for the previous period.
Extreme Point (EP): The highest high of the current uptrend.
Acceleration Factor (AF): Starting at .02, AF increases by .02 each time the extreme point makes a new high. AF can reach a maximum of .20, no matter how long the uptrend extends.
Current SAR = Prior SAR + Prior AF(Prior EP - Prior SAR)
13-Apr-10 SAR = 48.28 = 48.13 + .14(49.20 - 48.13)
The Acceleration Factor is multiplied by the difference between the Extreme Point and the prior period's SAR. This is then added to the prior period's SAR. Note however that SAR can never be above the prior two periods' lows. Should SAR be above one of those lows, use the lowest of the two for SAR.
The Parabolic SAR is a popular indicator that is mainly used by traders to determine the future short-term momentum of a given asset. The indicator was developed by the famous technician known as Welles Wilder and can also easily be applied to a trading strategy, enabling a trader to determine where stop orders should be placed. The calculation of this indicator is rather complex and goes beyond the scope of how it is practically used in trading.
One of the most interesting aspects of this indicator is that it assumes that a trader is fully invested in a position at any point in time. For this reason, it is of specific interest to those who develop trading systems and traders who wish to always have money at work in the market.
The Parabolic SAR indicator is graphically shown on the chart of an asset as a series of dots placed either above or below the price (depending on the asset's momentum). A small dot is placed below the price when the trend of the asset is upward, while a dot is placed above the price when the trend is downward. As you can see from the chart below, transaction signals are generated when the position of the dots reverses direction and is placed on the opposite side of the price as it was earlier.
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