Definition:Time Series/Actual Value

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An actual value of a time series $T$ is the result of a measurement of an observation at some time $t$.

The term is usually made in reference to a forecast value made after its lead time has elapsed, and its timestamp is now the current time.

Also see


$1$: Introduction:
$1.1$ Four Important Practical Problems:
$1.1.1$ Forecasting Time Series