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What are "lagged values" from autocorrelation topic

What are “lagged values” from autocorrelation topic? What is the difference from “normal values”?

Review the key concepts and receive exam tips just before you take the exam!

You are working with a time series of data.  What this essentially means is you take the original time series and create a second time series of data by -1 periods.  The (t-1) data is the lagged data (see the pattern below).

Period / (t) / (t-1)

1 / 8.5  / –

2 / 3.1 / 8.5

3 / 2.5 / 3.1

4 / 4.8 / 2.5

etc.

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