Bind time series which have a common frequency.
NAs to the total time coverage,
restricts to the time covered by all the series.
two or more univariate or multivariate time series, or objects which can coerced to time series.
As a special case,
... can contain vectors or matrices of the
same length as the combined time series of the time series present, as
well as those of a single row.
A time series object if
FALSE, otherwise a
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