prediction = rep(0, horizon)
for (i in seq_along(fdays))
prediction = prediction + similarities[i] * data$getCenteredSerie(fdays[i]+1)[1:horizon]
prediction = rep(0, horizon)
for (i in seq_along(fdays))
prediction = prediction + similarities[i] * data$getCenteredSerie(fdays[i]+1)[1:horizon]