This paper discusses the role of expert's observations in different practices of decision making. In these practices it is never the case that the observations of one sole expert is being used, so discussing the role of expert’s observations implies a discussion of how these observations are combined. The practices that will be discussed are cases from economics and econometrics, with the exception of a case in risk analysis, which provides a rather lucid example of a practice in between statistics and the intuitive expert. These practices will be discussed in their historical context, starting with a notorious debate in econometrics on the role of statistics.
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