Exponentially Weight Moving Average 

An exponential moving average (EMA), also known as an exponentially weighted moving average (EWMA),is a type of infinite impulse response filter that applies weighting factors which decrease exponentially. The weighting for each older datum decreases exponentially, never reaching zero. 

ewma(_)     <returns exponentially weighted moving average for select variable over selected time range>

Syntax Example using power:

Additional Syntax:

coming soon

Common examples:

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