Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
One of the virtues of parameter preference models (presented in general form in Rubinstein [23]) is their empirical content. Applied models of financial theory rely heavily on the mean variance (MV) version of parameter preference. As spelled out in Samuelson [25], MV models are adequate with compact distributions of returns and when portfolio decisions are made frequently so that the risk parameter becomes sufficiently small.