SER operations are like VAR operations, but they offer transformations
needed in management of time series.
The general form of a SER operation is
SER <new_series>=<operation>(<old_series>,P1,P2,...Pn) TO <data>
where <old_series> and <new_series> are variables in <data>.
If <data> is a data file (not a data matrix in the edit field),
<new_series> is created when necessary.
If a series of SER operations is activated, the extension TO <data>
is not required when the same (current) data file is used.
M = Moving averages (operations MA,MAE)
D = Differences (D)
C = Cumulative sums (CUM)
S = Moving sums and linear combinations (MS)
X = Examples of SER operations
T = More information on time series analysis
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