agg_order: Highest available sampling frequency per seasonal cycle (max. order of temporal aggregation, m), or a vector representing a subset of p factors of m.
fh: Forecast horizon for the lowest frequency (most temporally aggregated) time series (default is 1).
tew: A string specifying the type of temporal aggregation. Options include: "sum" (simple summation, default), "avg" (average), "first" (first value of the period), and "last" (last value of the period).
sparse: Option to return sparse matrices (default is TRUE).
Returns
A list with five elements: - dim: A vector containing information about the maximum aggregation order (m), the number of factor (p), the partial (ks) and total sum (kt) of factors.
set: The vector of the temporal aggregation orders (in decreasing order).
agg_mat: The temporal linear combination or aggregation matrix.