%--- help for ts/describe ---
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%  Print the description of the time series object
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%  Args:
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%     db (ts object): time series to describe
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%  Note:
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%     The function prints
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%        - mean
%        - standard deviation
%        - min
%        - 25th percentile
%        - 50th percentile
%        - 75th percentile
%        - max
%        - variable names
%        - variable descriptions
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%