Adjustment of forecasts with model consistent expectations

Abstract This paper provides a practical procedure to support the judgemental adjustment of statistical forecasts, for the class of problems where judgement is necessary to compensate for omitted variables in the model. The analysis suggests that many casual adjustments in practice may be prone to a double-counting bias, and that the use of model-consistent expectations , for the omitted variables, should provide a basis for judgemental adjustments free of such bias. The procedure is applied to a real case study, from the petroleum industry, based upon capital cost forecasting for major offshore facilities.

[1]  Roy Batchelor,et al.  Conservatism and consensus‐seeking among economic forecasters , 1992 .

[2]  Robert J. Genetski,et al.  Long-Range Forecasting: From Crystal Ball to Computer , 1981 .

[3]  A. Diamantopoulos,et al.  Judgemental revision of sales forecasts: A longitudinal eetension , 1989 .

[4]  Stanley R. Johnson,et al.  Advanced Econometric Methods , 1984 .

[5]  P. Powell.  Expertise and Decision Support , 2013 .

[6]  Ahti Salo,et al.  Decomposition in the assessment of judgmental probability forecasts , 1995 .

[7]  Fred Collopy,et al.  Causal Forces: Structuring Knowledge for Time-Series Extrapolation , 1993 .

[8]  T. Hassard,et al.  Applied Linear Regression , 2005 .

[9]  C. J. Wolfe,et al.  Judgmental adjustment of earnings forecasts , 1990 .

[10]  D. Bunn,et al.  Interaction of judgemental and statistical forecasting methods: issues & , 1991 .

[11]  Adedeji B. Badiru,et al.  DDM: Decision support system for hierarchical dynamic decision making , 1993, Decis. Support Syst..

[12]  Jae Kyu Lee,et al.  UNIK-FCST: knowledge-assisted adjustment of statistical forecasts , 1990 .

[13]  Michael R. Donihue.  Evaluating the role judgment plays in forecast accuracy , 1993 .

[14]  Luis G. Vargas,et al.  Prediction, Projection And Forecasting , 1990 .

[15]  C. J. Wolfe,et al.  Judgmental adjustment of forecasts: A comparison of methods , 1992 .

[16]  D. Turner.  The role of judgement in macroeconomic forecasting , 1990 .

[17]  Adamantios Diamantopoulos,et al.  Judgemental revision of sales forecasts: The relative performance of judgementally revised versus non‐revised forecasts , 1992 .