Search results for "Project"
showing 10 items of 3466 documents
Value preserving portfolio strategies in continuous-time models
1997
We present a new approach for continuous-time portfolio strategies that relies on the principle of value preservation. This principle was developed by Hellwig (1987) for general economic decision and pricing models. The key idea is that an investor should try to consume only so much of his portfolio return that the future ability of the portfolio should be kept constant over time. This ensures that the portfolio will be a long lasting source of income. We define a continuous-time market setting to apply the idea of Hellwig to securities markets with continuous trading and examine existence (and uniqueness) of value-preserving strategies in some widely used market models. Further, we discuss…
Fuzzy Mathematical Programming for Portfolio Management
2000
The classical portfolio selection problem was formulated by Markowitz in the 1950s as a quadratic programming problem in which the risk variance is minimized. Since then, many other models have been considered and their associated mathematical programming formulations can be viewed as dynamic, stochastic or static decision problems. In our opinion, the model formulation depends essentially on two factors: the data nature and the treatment given to the risk and return goals. In this communication, we consider several approaches to deal with the data uncertainty for different classical formulations of the portfolio problem. We make use of duality theory and fuzzy programming techniques to ana…
ESTIMATION OF RATES OF RETURN TO INVESTMENTS IN EDUCATION IN LATVIA
2021
The aim of the article is to prove the positive impact of education on work salary. For this purpose, the main task of the article is toestimate the Mincer rate of return by taking several factors into account. A secondary task of the research is to analyze the results of2010 and 2011 and to find explanations for the significant differences between the two years. The results of research and a detailedanalysis of the labour market indicate a positive return from attainment of education at an individual level, and they strengthen thehypothesis about a correlation among higher education attainment, higher employment levels and welfare. So far, the Mincer rate ofreturn has not been widely used …
Time and work generalised precedence relationships in project scheduling with pre-emption: An application to the management of Service Centres
2012
Abstract In this paper we present an application of project scheduling concepts and solution procedures for the solution of a complex problem that comes up in the daily management of many company Service Centres. The real problem has been modelled as a multi-mode resource-constrained project scheduling problem with pre-emption, time and work generalised precedence relationships with minimal and maximal time lags between the tasks and due dates. We present a complete study of work GPRs which includes proper definitions, a new notation and all possible conversions amongst them. Computational results that show the efficiency of the proposed hybrid genetic algorithm and the advantages of allowi…
Cross‐lagged associations between kindergarten teachers' causal attributions and children's task motivation and performance in reading
2009
The present study investigated whether kindergarten teachers' causal attributions would predict children's reading‐related task motivation and performance, or whether it is rather children's motivation and performance that contribute to teachers' causal attributions. To investigate this, 69 children (five to six years old at baseline) and their teachers were examined twice during the kindergarten year. Teachers filled in a questionnaire measuring their causal attributions twice during the kindergarten year. Information about the children's reading‐related task motivation and performance was gathered at the beginning of and at the end of the kindergarten year. The results showed that the hig…
Are decisions in a real choice experiment consistent with reservation prices elicited with BDM 'auction'? The case of French baguettes
2014
Abstract The aim of this study was to compare consumer choices observed in a real choice experiment and their reservation prices elicited with the BDM mechanism in order to assess the rationality of participant behaviors. One hundred and seventy-seven participants tested four French baguettes in each task. For the real choice experiment, participants were faced with 17 scenarios (17 × 4 baguette-price combinations). In each method, participants could select a “no purchase” option. Comparing choices and reservation prices made it possible to assess the rationality of participant behaviors. From a strict economic standpoint, 50% of observed choices were fully rational. When one baguette was a…
Layout attributes and recall
2003
The spatial arrangement of elements such as icons in a computer interface may influence learning the interface. However, the effects of layout organization on users' information processing is relatively little studied so far. The three experiments of this paper examined two attributes of layouts: spatial grouping by proximity and semantic coherence. Learning was assessed by tasks in which 30 participants recalled icon-like items' labels, locations, or both as a series of study-recall trials. The results show that layout organization interacts with task demands. Semantic organization improves recall of labels, and spatial grouping supports recall of locations. When both labels and locations …
Improvement of working memory performance by training is not transferable
2011
Working memory (WM) usually refers to a cognitive system devoted to the simultaneous maintenance and processing of information which plays a crucial role in high-level cognition. Recently, Barrouillet and collaborators showed the importance of controlling the time course of cognitive activities to assess WM capacities. Therefore, they developed a new paradigm to systematically explore the functioning of WM that involved simple but time-constrained activities as processing component. In comparison with traditional tasks, these computer-paced span tasks provide a more accurate evaluation of WM capacities and turned out to be the most predictive of complex cognitive achievements. The present s…
Rational Poverty or Poor Rationality? The Take‐up of Social Assistance Benefits
2001
In several countries social assistance dependence has been increasing since the 1980s. After surveying the theoretical and empirical take-up literature, this study presents estimates of recent rates of non take-up of social assistance benefits. Once methodological shortcomings of prior estimations are corrected, the results show that take-up has fallen recently and thus cannot explain the rising welfare receipt. Following theoretical predictions, the probability that a rational individual takes up social assistance increases with the expected benefit amount and duration, and falls with application cost and stigma. More than half of all households eligible for transfers under the German soci…
Euro Crisis and plurality: Does the political orientation of newspapers determine the selection and spin of information?
2016
This article studies the impact of right and left moderate political orientation of newspapers on the levels of plurality in the news coverage of the Euro Crisis in 20 newspapers from 10 European countries through a methodology based on Simpson’s D index. The expectation of finding distinct patterns of coverage leading to high levels of plurality was not fully supported and the results have shown that national frames influence levels of overall plurality more than political ideology.