This function returns the summing matrix for a hierarchical or grouped time series, as defined in Hyndman et al. (2011).
Hierarchical or grouped time series of class
A numerical matrix.
R. J. Hyndman, R. A. Ahmed, G. Athanasopoulos and H.L. Shang (2011) Optimal combination forecasts for hierarchical time series. Computational Statistics and Data Analysis, 55(9), 2579–2589. http://robjhyndman.com/papers/hierarchical/
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