← Search Econometrica Vol. 30 No. 4 1962 Optimal Aggregation in Multi-Equation Prediction Models Walter D. Fisher DOI10.2307/1909323 Volume30 Issue4 Pages744 Sources semanticscholar openalex crossref Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓