Rosner and Markowitz Respond

Martin Rosner Æ Rolf

The isotopic analysis of boron from material that carries only trace amounts of boron requires low boron blank levels. Large efforts are taken to keep blank levels low by purifying reagents. We performed exposure experiments and determined procedure blanks before and after the air-handling system was modified from silicate glass filters to polyethylene/polystyrole and active carbon filters. Our...

Sparse and stable Markowitz portfolios.

We consider the problem of portfolio selection within the classical Markowitz mean-variance framework, reformulated as a constrained least-squares regression problem. We propose to add to the objective function a penalty proportional to the sum of the absolute values of the portfolio weights. This penalty regularizes (stabilizes) the optimization problem, encourages sparse portfolios (i.e., por...

Prospect and Markowitz Stochastic Dominance

Levy and Levy (2002, 2004) develop the Prospect and Markowitz stochastic dominance theory with S-shaped and reverse S-shaped utility functions for investors. In this paper, we extend Levy and Levy’s Prospect Stochastic Dominance theory (PSD) and Markowitz Stochastic Dominance theory (MSD) to the first three orders and link the corresponding S-shaped and reverse S-shaped utility functions to the...

Richard Rosner, MD: pioneer in forensic psychiatry.

“If you don’t do it, someone worse will.” Richard Rosner, MD, Clinical Professor of Psychiatry at New York University School of Medicine, Director of NYU’s Forensic Psychiatry Residency Program, and seminal figure in North American forensic psychiatry enjoys his own pithy observation. He trots it out to encourage his students to run for political office in professional organizations and to expl...

On Inverse Markowitz' Eventological Problem