How often the observations of a time series occur is called the sampling frequency or the periodicity of the series. For example, a time series with one observation each month has a monthly sampling ...

The INTERVAL= option is used to establish the frequency of the time series. For example ... PROC FORECAST uses the ID variable in the following ways: to validate the data periodicity. When the ...

Key Points Autocorrelation is a correlation derived from a time series variable and its values over a given period. It is ...