In time series analysis, the lag operator (L) or backshift operator (B) operates on an element of a time series to produce the previous element. For example in https://en.wikipedia.org/wiki/Lag_operator
David Eugene Booth
Things like this usually depend on the software. Google the question for your particular program. D. Booth
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Mahmood Rudbaraki
I use ARIMA model for forecasting and then use it's back shift equation to Special System Dynamic Model, But How can make it's block simulation?
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Babak Jamshidi
Your question needs to get more clarified. Is your question fundamental?
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