Weighted utility models attempt to account for risk preferences in terms of an expectation-like equation applied to the subjective evaluation of probabilities and outcomes, while Portfolio theory assumes that risk preference is a function of expected value and perceived risk. A pair of empirical predictions which contrasts Portfolio theory with all weighted utility models is derived and tested....

The most natural way of ordering portfolios is by comparing their payoffs. If a port­ folio has a payoff higher than the payoff of another portfolio, then it is greater than the other portfolio. This order is called the portfolio dominance order. An important property that a portfolio dominance order may have is the lattice property. It requires that the supremum and the infimum of any two port...

BACKGROUND Portfolios are increasingly used in undergraduate and postgraduate medical education. Four medical schools have collaborated with an established NHS electronic portfolio provider to develop and implement an authentic professional electronic portfolio for undergraduate students. We hypothesized that using an authentic portfolio would have significant advantages for students, particula...

E-Portfolio is considered as a digital collection of students’ work which demonstrates their reflections, experiences and progress over a period of time. Students can collaborate with other students and their lecturers through e-Portfolio. This paper explains the importance of uses and gratification theory in an electronic portfolio. Using the theory, this paper will investigate and examine the...

Modern portfolio theory is based on a rational investor choosing the proportions of assets in a portfolio so as to minimize risk and maximize the expected return. In this paper, we investigate the applicability of different stochastic search heuristics to the problem of finding the optimum portfolio. We compare their performance on two problems with known solutions. 1. Portfolio Optimization Gi...

In portfolio optimization, the inverse covariance matrix prescribes the hedge trades where a portfolio of stocks hedges each one with all the other stocks to minimize portfolio risk. In practice with finite samples, however, multicollinearity makes the hedge trades too unstable to be reliable. By reducing the number of stocks in each hedge trade to curb estimation errors, we motivate a “sparse”...

Our objective is to develop a methodology to detect regions in risk-return space where the out-of-sample performance of portfolios is consistent with their in-sample performance. We use the Berkowitz statistic to evaluate the accuracy of the density forecast, derived from in-sample portfolio returns, of out-of-sample portfolio returns. Defined by its coordinates in risk-return space, a portfoli...

Electronic portfolios represent an assessment measure with strong potential for providing feedback about student performance to improve curricula and pedagogy, determining individual students’ mastery of learning and providing feedback for improvement, and actively involving students in the assessment process. This study examined the relationship between e-portfolio participation and student su...

the present paper aimed at studying the current models of credit portfolio management. there are currently three types of models which consider the risk of credit portfolio: the structural models (moody's kmv model, and credit- metrics model), the intensity models (the actuarial models) and the econometric models (the macro-factors model). the development of these three types of models is based...

The present randomised parallel study assessed the impact of adding MUFA to a dietary portfolio of cholesterol-lowering foods on the intravascular kinetics of apoAI- and apoB-containing lipoproteins in subjects with dyslipidaemia. A sample of sixteen men and postmenopausal women consumed a run-in stabilisation diet for 4 weeks. Subjects were then randomly assigned to an experimental dietary por...