Time series forecasting: ex ante vs ex post

Ex ante forecast is a forecast based solely on information available at the time of the forecast, whereas ex post forecast is a forecast that uses information beyond the time at which the forecast is made.

Forecasting without significance tests?

Statistical significance testing has little useful purpose in business forecasting, and other tools are to be preferred. For selecting or ranking forecasting methods (especially those based on models) there exist simple but powerful and practical …