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On the Jensen Measure and Marginal Improvements in Portfolio Performance: A Note
Author(s) -
JOBSON J. D.,
KORKIE BOB
Publication year - 1984
Publication title -
the journal of finance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 18.151
H-Index - 299
eISSN - 1540-6261
pISSN - 0022-1082
DOI - 10.1111/j.1540-6261.1984.tb03872.x
Subject(s) - measure (data warehouse) , portfolio , econometrics , mathematics , modern portfolio theory , mathematical economics , economics , computer science , statistics , financial economics , data mining
The marginal performance contribution made by new assets in a portfolio is identified. The maximum change in a portfolio's Sharpe performance from the addition of new assets is a simple function of a generalized Jensen index and the unexplained covariances from a multivariate market model. Deviations from a higher dimension market line may be used to rank the desirability of asset additions to an existing portfolio. Statistical tests for the equality of the performance contributions by new assets is possible.