# Communication à un séminaire :

Hashem Pesaran (Cambridge University),

« Forecast Combination across Estimation Windows »,

Econometrics Seminar, TSE, Toulouse, 22 juin 2010, 14:00-15:30, salle MF 323.

### Résumé

This paper considers combining forecasts generated from the same model but over different estimation windows. It develops theoretical results for random walks with breaks in the drift and volatility and for a linear regression model with a break in the slope parameter. Averaging forecasts over different estimation windows leads to a lower bias and root mean square forecast error than forecasts based on a single estimation window for all but the smallest breaks. An application to weekly returns on 20 equity index futures shows that averaging forecasts over estimation windows
leads to a smaller RMSFE than some competing methods.

C22 : Time-Series Models

C53 : Forecasting and Other Model Applications

Econométrie et Economie Empirique