Question: Forecast errors a . are the difference in successive values of a time series b . should all be nonnegative c . are the differences

Forecast errors
a. are the difference in successive values of a time series
b. should all be nonnegative
c. are the differences between actual and forecast values
d. should be summed to judge the goodness of a forecasting model
Forecast errors a. are the difference in successive values of a

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