Random variation is one of the four different components of a time series.It is caused by irregular and unpredictable changes in a time series that are not caused by any other component.It tends to mask the existence of the other more predictable components.

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Random variation is indeed caused by unpredictable and irregular changes in a time series that are not caused by any other component, and it can make it difficult to identify the other more predictable components of the series.

Random Variation Is One of the Four Different Components of a Time