a set of observations, results, or other data obtained over a period of time, usually at regular intervals: Monthly sales figures, quarterly inventory data, and daily bank balances are all time series.
A set of variables with values related to the respective times the variables are measured. Thus, a weekly record of a stock's price throughout a period of years is a time series. Time series are often used to project future values by observing how the value of a variable has changed in the past.
