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Title: On the effect of uncertainty on non-response to the European central bank survey of professional forecasters Authors:  Victor Lopez-Perez - Universidad Politecnica de Cartagena (Spain) [presenting]
Abstract: The purpose is to explore how changes in macroeconomic uncertainty have affected the decision to reply to the European Central Bank Survey of Professional Forecasters (ECB SPF). The results suggest that higher (lower) aggregate uncertainty increases (reduces) non-response to the survey. This effect is statistically and economically significant. Therefore, the assumption that individual ECB SPF data are missing at random may not be appropriate. Moreover, the forecasters that perceive more individual uncertainty seem to have a lower likelihood of replying to the survey. Consequently, measures of uncertainty computed from individual ECB SPF data could be biased downwards.