# Documentation

### Financial

The Williams %R (or Percent Range) function was developed by Larry Williams. It is similar to the Stochastic Oscillator function in that it relates the close price of a stock to its price range (high-low) over a specified number of time periods.

The Accumulation Distribution function is a technical indicator that considers both stock price and volume. Accumulation Distribution can be used to detect divergences between stock price movement and volume movement.

The Average True Range function computes an average of the True Range, which represents the range in price of a stock or commodity over the course of one day, or from one day to the next. Average True Range is used to indicate price volatility.

The Chaikin Money Flow function was developed by Marc Chaikin. It computes the sum of the Accumulation Distribution line values for a stock over a specified number of time periods, and divides this by the total stock volume over the same duration.

The Chaikin Oscillator function was developed by Marc Chaikin. It is calculated by subtracting the 10-day exponential moving average from the 3-day exponential moving average of the Accumulation Distribution line.

The Commodity Channel Index function was developed by Donald Lambert. It compares a stock price to its average over a specified number of time periods.

The Momentum function is a is a trend-following indicator that measures the speed of price movements by comparing the current stock price against its value from a specified number of time periods in the past.

The Money Flow Index function computes a relationship between the typical stock price and stock volume over a specified number of time periods.

The Negative Volume Index function calculates a cumulative value based on days where the trading volume has decreased from the previous day.

The On Balance Volume function was developed by Joseph Granville. It calculates a cumulative volume that depends on stock price.

The On Balance Weighted Volume function calculates a cumulative volume that depends on stock price.

The Parabolic SAR (stop-and-reverse) function was developed by J. Welles Wilder, Jr. It is a lagging technical indicator that can help you to determine when a stock is set to have a change in trend.

The Positive Volume Index function calculates a cumulative value based on days where the trading volume has increased from the previous day.

The Rate of Change function is a variation on the Momentum formula. ROC calculates the percentage difference between the day's closing stock price and the price from a specified number of time periods in the past.

The Relative Strength Indicator function was developed by J. Welles Wilder. It compares the average of up closes against the average of down closes over a specified number of time periods.

The Trend Confirmation Indicator function computes the ratio between a short-term moving average and a longer-term moving average of the stock price.

The Ultimate Oscillator function was developed by Larry Williams. It computes a weighted total of three oscillators, each of which is calculated using a different time period.

The Aroon Oscillator function is calculated as the difference between the Aroon Up and Aroon Down indicators, with resulting values ranging from -100 to 100.

The Average Directional Index function was developed by J. Welles Wilder. It combines two other indicators, the Positive Directional Indicator and the Negative Directional Indicator, which were also developed by Wilder.

The Fast Stochastic function compares the close price of a stock against its price range (high-low) over a specified number of time periods. Applications of this formula include the generation of buy and sell signals.

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