What is meant by a time series?
A time series consists of values observed over a set of sequentially ordered periods. This, for those who do SEO, is already an element of utmost interest.
Website traffic data, considered over a time sequence, is in fact an example of a time series.
Time series analysis is a set of methods that allow us to derive significant patterns or statistics from data with temporal information.
In very general terms, we can say that a time series is a sequence of random variables indexed in time.
The purpose of analyzing a time series can be descriptive (consider decomposing the series to remove seasonality elements or to highlight underlying trends) or inferential, with the latter including forecasting values for future time periods that have not yet occurred.
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