TY - JOUR T1 - The “Efficient Index” and Prediction of Portfolio Variance JF - The Journal of Portfolio Management SP - 27 LP - 34 DO - 10.3905/jpm.1993.409446 VL - 19 IS - 3 AU - Kenneth J Winston Y1 - 1993/04/30 UR - https://pm-research.com/content/19/3/27.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -