Definition:Moving Average Model/Nomenclature

Nomenclature for Moving Average Model
The name moving average model is a bit of a misnomer because:
 * $\text{(a)}: \quad$ the weights $1, -\theta_1, -\theta_2, \ldots$ need not all add up to $1$ (and in fact will generally not do so)
 * $\text{(b)}: \quad$ the weights need not in fact all be positive.

But the term is in common use, and so will be used on.