Calculates the Geometric Moving Average (GMA) for a given period for all possible
data points (i.e. periods) for which there is sufficient historical data provided.
- A collection of series objects. For example, to evaluate this indicator for two series
you will need to pass a series collection containing this two series.
- The number of periods over which the moving average is evaluated
for each period.
A series where the first term corresponds to the Moving Average on the
last period and the previous value is the value of the Moving average on the previous
period and so on.