OnlineTechnicalIndicators internals

Sub-indicator(s)

An indicator can be composed internally of sub-indicator(s). Input values catched by fit! calls are transmitted to each sub_indicators to be processed to _calculate_new_value function which calculates value of indicator output.

Example: Bollinger Bands (BB) indicator owns 2 internal sub-indicators

• central_band which is a simple moving average of prices,
• std_dev which is standard deviation of prices.

Composing new indicators

Indicators chaining

All indicators come with a great feature named indicators chaining. It's like building new indicator with Lego™ bricks.

Example:

• DEMA : 2 EMA chained together
• TEMA : 3 EMA chained together

Filtering and transforming input

Thanks to this indicator chaining feature it's possible to compose more complex indicators on top of the existing and simpler ones.

A mechanism for filtering and transforming input of an indicator which is feeded by an another one (using generally anonymous functions) have also be implemented.

Input of an indicator can be filtered / transformed to be used internaly by sub-indicators or be processed directly by _calculate_new_value function.

Moving average factory

• SMA, EMA, ... are moving average.

Most complex indicators uses in their original form SMA or EMA as default moving average.

In some markets they can perform better by using instead an other kind of moving average.

A moving average factory have been implemented

This kind of indicators have a ma parameter in order to bypass their default moving average uses.