Answer:
tracking signal
Explanation:
Thre tracking signal is a ratio between:
the sum all the forecasting errors:
∑(actual - forecast)
and the mean abosolute deviation
which is the sum of the errors ∑(actual - forecast) over the numbers forecast done.
Leaving the following formula:
∑(actual - forecast)/(∑(actual - forecast)/n)
It indicates if there is a bias is present in the model. It check if validity.
