Investors often use gold and Bitcoin to reduce the risk of financial investments by combining them due their low correlation different dynamic correlation. Therefore, it is essential study how a combination two can be invested maximize returns. In this paper, we combine BP neural network model gray analysis from future unpredictability quantification portfolio investment. We want construct pric...

The research reported in this study focuses on how distance students can learn to use argumentation processes as a tool for learning. For ten weeks, 30 student teachers studied the webbased 15 credit course Teacher Assignment. Data were collected from five student groups’ asynchronous argumentation, relating to authentic cases of teacher leadership. Focus was placed on the extent to which stude...

The purpose of our overall research agenda is to develop and evaluate a methodology for the assessment of teachers in which experienced teachers, serving as judges, engage in dialogue to integrate multiple sources of evidence about a candidate to reach a sound conclusion. The project that provides the venue for this research agenda is the Interstate New Teacher Assessment and Support Consortium...

Portfolios have been used for assessment in higher education as an alternative to exams and assignments. E-portfolios offer staff a digital technology that can be both a personalised learning space, owned and controlled by the learner, and a presentation tool which can be used for formal assessment purposes. However, this can result in a tension between process and product, where e-portfolios b...

This paper treats risk based on the notions of credibility measure and credibility expected value. Firstly, the paper derives and discusses the credibility expected value. Secondly, the paper presents a new method of analysis of possibilistic portfolios. The new step is a construction by which with a possibilistic portfolio one associates a probabilistic portfolio. The problem solving of possib...

AIM Portfolios are often used as an instrument with which to stimulate students to reflect on their experiences. Research has shown that working with portfolios does not automatically stimulate reflection. In this study we addressed the question: What are the conditions for successful reflective use of portfolios in undergraduate medical education? METHODOLOGY/RESEARCH DESIGN: We designed a por...