Time-Series Data

Two prices can be compared only after their dates, time zones and sampling intervals are understood. This lesson builds a sorted time index, checks duplicates and combines observations by timestamp. It then resamples prices with an explicit rule. Start with pandas for labelled tables; use API checks when the observations come from a service.

Learning objectives. By the end of this note you should be able to parse timestamps, sort and test uniqueness, localise a time zone, align series and resample with an explicit aggregation rule.