6.
Process or Product Monitoring and Control
6.4. Introduction to Time Series Analysis


Univariate Time Series  The term "univariate time series"
refers to a time series that consists of single (scalar) observations recorded
sequentially over equal time increments. Some examples are
monthly
CO_{2} concentrations and southern oscillations
to predict el nino effects.
Although a univariate time series data set is usually given as a single column of numbers, time is in fact an implicit variable in the time series. If the data are equispaced, the time variable, or index, does not need to be explicitly given. The time variable may sometimes be explicitly used for plotting the series. However, it is not used in the time series model itself. The analysis of time series where the data are not collected in equal time increments is beyond the scope of this handbook. 

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