In time series analysis, the lag operator or backshift operator operates on an element of a time series to produce the previous element. For example, given some time series
then
- for all
or equivalently
- for all
where L is the lag operator. Sometimes the symbol B for backshift is used instead. Note that the lag operator can be raised to arbitrary integer powers so that
and
Read more about Lag Operator: Lag Polynomials, Difference Operator, Conditional Expectation
Famous quotes containing the word lag:
“I could be well content
To entertain the lag end of my life
With quiet hours.”
—William Shakespeare (15641616)