RT Journal Article SR Electronic T1 The Meaning of the Mean JF The Journal of Portfolio Management FD Institutional Investor Journals SP 23 OP 27 DO 10.3905/jpm.1979.408702 VO 5 IS 4 A1 Carl Schweser A1 Robert M. Soldofsky A1 Thomas Schneeweis YR 1979 UL https://pm-research.com/content/5/4/23.abstract AB