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Bollinger Bands are volatility curves used to identify extreme highs or lows in relation to price. Bollinger Bands establish trading parameters, or bands, based on the moving average of a particular instrument and a set number of standard deviations around this moving average.

For example, a trader might decide to use a 10-day moving average and 2 standard deviations to establish Bollinger Bands for a given currency. After doing so, a chart will appear with price bars capped by an upper boundary line based on price levels 2 standard deviations higher than the 10-day moving average and supported by a lower boundary line based on 2 standard deviations lower than the 10-day moving average. In the middle of these two boundary lines will be another line running somewhat close to the middle area depicting in this case, the 10-day moving average. Both the moving average and the number of standard deviations can be altered to best suit a particular currency.

Jon Bollinger, creator of Bollinger Bands recommends using a simple 20-day moving average and 2 standard deviations. Because standard deviation is a measure of volatility, Bollinger Bands are dynamic indicators that adjust themselves (widen and contract) based on the current levels of volatility in the market being studied. When prices hit the upper or lower boundaries of a given set of Bollinger Bands, this is not necessarily an indication of an imminent reversal in a trend. It simply means that prices have moved to the upper limits of the established parameters. Therefore, traders should use another study in conjunction with Bollinger Bands to help them determine the strength of a trend.

Commodity Channel Index (CCI) - It measures the variation of a security's price from its statistical mean. High values show that prices are unusually high compared to average prices whereas low values indicate that prices are unusually low. Contrary to its name, the CCI can be used effectively on any type of security, not just commodities. The CCI was developed by Donald Lambert.

Exponential Moving Average (EMA) - Here, the averages are calculated with the recent forex rates carrying more weight in the overall average; for example: In a 10-day exponential moving average, the last 5 days will have more effect on the average than the first 5 days. The idea is to use the most recent data as a better indication of trend direction.

MACD - Moving Average Convergence/Divergence - Consists of two exponential moving averages that are plotted against the zero line. The zero line represents the times the values of the two moving averages are identical. The MACD is calculated by subtracting a 26-day moving average of a currency's price from a 12-day moving average of its price. The result is an indicator that oscillates above and below zero. When the MACD is above zero, it means the 12-day moving average is higher than the 26-day moving average. This is bullish as it shows that current expectations (i.e., the 12-day moving average) are more bullish than previous expectations (i.e., the 26-day average). This implies a bullish, or upward, shift in the forex rate. When the MACD falls below zero, it means that the 12-day moving average is less than the 26-day moving average, implying a bearish shift in the currency.

Rate of Change - The oldest closing price divided into the most recent one

RSI (Relative Strength Index) - The RSI is a price-following oscillator that ranges between 0 and 100. A popular method of analyzing the RSI is to look for a divergence in which the currency price is making a new high, but the RSI is failing to surpass its previous high. This divergence is an indication of an impending reversal. When the RSI then turns down and falls below its most recent trough, it is said to have completed a "failure swing." The failure swing is considered a confirmation of the impending reversal in the price of the currency.

Stochastics - Stochastic studies are based on the premise that as prices rise, closing prices tend to be near the high value. Conversely, as prices fall, closing prices are near the low for the period. Stochastic studies are made of two lines, %D and %K, that move between a scale of 0 and 100. The %D line is the moving average over a specified period of time of the %K line. The %K line measures where the closing price of a currency is compared to the price range for a given number of periods.

Volatility - Measures the overall volatility of a currency in a given time period.

William's %R - A momentum indicator that measures overbought/oversold levels in the price of a currency. The interpretation of Williams' %R is very similar to that of the Stochastic Oscillator, except that %R is plotted upside-down and the Stochastic Oscillator has internal smoothing. Readings in the range of 80 to 100% indicate oversold, while readings in the 0 to 20% range suggest overbought.

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