equally weighted for calculating the mean.</p>
<p>LWMA: weights decrease in arithmetical progression. The observations
directly next to a central value i, have weight 1/2, the observations
one further away (i-2,i+2) have weight 1/3, the next (i-3,i+3) have
weight 1/4, ...</p>
<p>EWMA: uses weighting factors which decrease exponentially. The observations
directly next to a central value i, have weight 1/2^1, the observations one
further away (i-2,i+2) have weight 1/2^2, the next (i-3,i+3) have weight 1/2^3, 