← Search Journal of Finance Vol. 39 No. 1 1984 On the Jensen Measure and Marginal Improvements in Portfolio Performance: A Note J. D. Jobson; Bob Korkie DOI10.2307/2327680 Volume39 Issue1 Pages245 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 ✓