Time Series

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Series of observations (data points) in time order.

In many SDMX use cases, time series have a defined frequency which is either explicitly defined using a 'FREQ' or similar dimension, or implicitly derived from the observation timestamps. For instance, observations with timestamps of '2015, 2016 and 2017' imply the frequency is annual. Whereas observations with timestamps '2015-Q1, 2015-Q2 and 2015-Q3' imply quarterly.