Forecast error
difference between the actual or real and the predicted or forecast value of a time series or any other phenomenon of interest
en-US/ˈfɔɹˌkæst ˈɛɹɚ/
en-GB/ˈfɔːkɑːst ˈɛɹə/
difference between the actual or real and the predicted or forecast value of a time series or any other phenomenon of interest