Are Forecast Updates Progressive?
National Chung Hsing University - Department of Applied Economics, Department of Finance
Philip Hans Franses
Erasmus University Rotterdam (EUR) - Department of Econometrics
Erasmus University Rotterdam - Erasmus School of Economics, Econometric Institute; Tinbergen Institute; University of Tokyo - Centre for International Research on the Japanese Economy (CIRJE), Faculty of Economics
April 12, 2010
Macro-economic forecasts typically involve both a model component, which is replicable, as well as intuition, which is non-replicable. Intuition is expert knowledge possessed by a forecaster. If forecast updates are progressive, forecast updates should become more accurate, on average, as the actual value is approached. Otherwise, forecast updates would be neutral. The paper proposes a methodology to test whether forecast updates are progressive and whether econometric models are useful in updating forecasts. The data set for the empirical analysis are for Taiwan, where we have three decades of quarterly data available of forecasts and updates of the inflation rate and real GDP growth rate. The actual series for both the inflation rate and the real GDP growth rate are always released by the government one quarter after the release of the revised forecast, and the actual values are not revised after they have been released. Our empirical results suggest that the forecast updates for Taiwan are progressive, and can be explained predominantly by intuition. Additionally, the one-, two- and three-quarter forecast errors are predictable using publicly available information for both the inflation rate and real GDP growth rate, which suggests that the forecasts can be improved.
Number of Pages in PDF File: 23
Keywords: Macro-economic forecasts, econometric models, intuition, initial forecast, primary forecast, revised forecast, actual value, progressive forecast updates, forecast errors.
JEL Classification: C53, C22, E27, E37working papers series
Date posted: April 14, 2010
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