Judgement or models: The importance of task differences
Over twenty years research on cognitive biases and limitations has built a strong case for managers not to use their judgement if a suitable formula or model is available. Much of this work was built on research demonstrating that in an environment where the judgemental cues are well established, pre-specified and not auto-correlated and where there is little contextual information, that a model based on expert judgement (a model-of-man) is more accurate than the expert himself. However, much practical decision making takes place in a setting where cues are not well established, where auto-correlation is present, and where there is general contextual information. This study investigated decisions made in such a setting, namely time series forecasting. Forecasts were estimated judgementally for 111 real life time series. These estimates were then used to construct a model-of-man and the forecasts from this model compared in accuracy with the original judgemental forecasts. This study found the model-of-man not to be superior to man when assessed in terms of forecast accuracy thus demonstrating a commonly occurring task setting in which the dominant research result in not true.
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Volume (Year): 24 (1996)
Issue (Month): 3 (June)
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References listed on IDEAS
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- E. H. Bowman, 1963. "Consistency and Optimality in Managerial Decision Making," Management Science, INFORMS, vol. 9(2), pages 310-321, January.
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- Dawes, Robyn & Fildes, Robert & Lawrence, Michael & Ord, Keith, 1994. "The past and the future of forecasting research," International Journal of Forecasting, Elsevier, vol. 10(1), pages 151-159, June.
- Lawrence, Michael J. & Edmundson, Robert H. & O'Connor, Marcus J., 1985. "An examination of the accuracy of judgmental extrapolation of time series," International Journal of Forecasting, Elsevier, vol. 1(1), pages 25-35.
- Robert C. Blattberg & Stephen J. Hoch, 1990. "Database Models and Managerial Intuition: 50% Model + 50% Manager," Management Science, INFORMS, vol. 36(8), pages 887-899, August.
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