Chaikin Oscillator
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The Chaikin Oscillator is simply the Moving Average Convergence Divergence indicator (MACD) applied to the Accumulation/Distribution Line. The formula is the difference between the 3day exponential moving average and the 10day exponential moving average of the Accumulation/Distribution Line. Just as the MACDHistogram is an indicator to predict moving average crossovers in MACD, the Chaikin Oscillator is an indicator to predict changes in the Accumulation/Distribution Line.
... Courtesy of StockCharts
ChaikinOscillator(int fast, int slow)
ChaikinOscillator(ISeries<double> input, int fast, int slow)
Returns default value
ChaikinOscillator(int fast, int slow)[int barsAgo]
ChaikinOscillator(ISeries<double> input, int fast, int slow)[int barsAgo]
double; Accessing this method via an index value [int barsAgo] returns the indicator value of the referenced bar.
fast 
The number of bars to calculate the fast EMA 
input 
Indicator source data (?) 
slow 
The number of bars to calculate the slow EMA 

You can view this indicator method source code by selecting the menu New > NinjaScript Editor > Indicators within the NinjaTrader Control Center window.