Calculates weighted geometric mean (see references). Note
p=rep(1, nrow(y)) (default) then this is just the
geometric mean of rows.
shifted data matrix (e.g., output of shiftp)
weights (should not be closed)
vector (weighted geometric mean of rows)
J. J. Egozcue, V. Pawlowsky-Glahn (2016) Changing the Reference Measure in the Simplex and its Weighting Effects. Austrian Journal of Statistics 45(4):25-44
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