Enhancing accounting students' problem-solving skills: the use of a hands-on conceptual model in an active learning environment

This study documents and evaluates the effectiveness of using a hands-on conceptual model in an active learning environment in a first accounting class. A hands-on model that can be used to help students learn inventory cost allocations is described. The model's potential for enhancing student learning is assessed. Three learning scenarios are evaluated. The first is predominately a traditional lecture-oriented approach using numerical examples to illustrate concepts. The second adds the use of a model within a lecture setting. The third uses an active learning approach along with the model. Student performance and preferences are assessed. Students indicate they perceive that the model helped them understand inventory cost allocations better than solely using numerical examples. Results from an assessment instrument indicate that students who use the model in an active learning environment show enhanced problem-solving skills over that which can be attained in a lecture-oriented environment. There is no evidence, however, that the use of a conceptual hands-on model enhances conceptual recall over that which can be attained in a lecture-oriented environment.     

Mental models and social representations of hazards: the significance of identity processes

This article examines the social influence processes that underpin the development of individual mental models of hazards and analyses the role that identity processes play in determining the nature and plasticity of the representations of risk that an individual will employ. It outlines the nature of the mental models approach (Morgan, Fischhoff, Bostrom and Atman, in press) to developing interventions in risk communication. It describes how social representations theory (Moscovici, 1988) can be used to account for the genesis and maintenance of a mental model of a hazard. In doing so, it is argued that mental models of hazards are social constructions, serving identifiable social purposes for the subculture in which they are elaborated, and that they are generally shared by the members of that subculture. However, within a group or subculture, there will be some individual variation in access to and use of a mental model of a hazard. It is suggested here that these variations are largely predictable on the basis of identity processes (Breakwell, in press). The implications of this analysis for risk communication strategies is explored.     

Hypoglycemia: An overview of fear of hypoglycemia,quality-of-life,and impact on costs

Abstract

Background:

The clinical goal in the treatment of diabetes is to achieve good glycemic control. Tight glycemic control achieved with intensive glucose lowering treatment reduces the risk of long-term micro- and macro-vascular complications of diabetes, resulting in an improvement in quality-of-life for the patient and decreased healthcare costs. The positive impact of good glycemic control is, however, counterbalanced by the negative impact of an increased incidence of hypoglycemia.

Methods:

A search of PubMed was conducted to identify published literature on the impact of hypoglycemia, both on patient quality-of-life and associated costs to the healthcare system and society.

Results:

In people with type 1 or type 2 diabetes, hypoglycemia is associated with a reduction in quality-of-life, increased fear and anxiety, reduced productivity, and increased healthcare costs. Fear of hypoglycemia may promote compensatory behaviors in order to avoid hypoglycemia, such as decreased insulin doses, resulting in poor glycemic control and an increased risk of serious health consequences. Every non-severe event may be associated with a utility loss in the range of 0.0033–0.0052 over 1 year, further contributing to the negative impact.

Limitations:

This review is intended to provide an overview of hypoglycemia in diabetes and its impact on patients and society, and consequently it is not a comprehensive evaluation of all studies reporting hypoglycemic episodes.

Conclusion:

To provide the best possible care for patients and a cost-effective treatment strategy for healthcare decision-makers, a treatment that provides good glycemic control with a limited risk of hypoglycemia would be a welcome addition to diabetes management options.     

二维连续型随机变量卷积公式探讨

本文主要讨论二维独立连续型随机变量,多数教材在求解卷积公式时采用积分变量代换,在教学中大多数学生难以明白,本文将利用微积分学基本定理对卷积公式证明,帮助学生更好的理解和掌握卷积公式,并进行实例分析。     

Testing for heteroskedasticity and serial correlation in a random effects panel data model

This paper considers a panel data regression model with heteroskedastic as well as serially correlated disturbances, and derives a joint LM test for homoskedasticity and no first order serial correlation. The restricted model is the standard random individual error component model. It also derives a conditional LM test for homoskedasticity given serial correlation, as well as, a conditional LM test for no first order serial correlation given heteroskedasticity, all in the context of a random effects panel data model. Monte Carlo results show that these tests along with their likelihood ratio alternatives have good size and power under various forms of heteroskedasticity including exponential and quadratic functional forms.     

Individual utility in a context of asymmetric sensitivity to pleasure and pain: an interpretation of Bentham's felicific calculus

This paper aims at exploring, in a formal way, Bentham's statement that ‘the pleasure of gaining is not equal to the evil of losing’, which belongs to those aspects of the principle of utility left aside by Jevons‘ reconstruction. Consequently, the agent’s preference order will be viewed as depending on his initial situation, and on asymmetric sensitivity to gains and losses, relative to this situation. This leads 1) to discuss the coexistence of multiple preference orders, illustrated by Bentham's analysis of the optimal labour contract; and 2) to introduce true deliberation as a consequence of the gap between positive choice and rival assessments of utility.     

中国通货膨胀率与其不确定性之间的非线性动态关系

通货膨胀率和通货膨胀不确定性之间相互影响,二者之间的内在关系对政府运用货币政策具有重要的现实意义。本文采用1990年1月以来居民消费价格指数(CPI)的月度数据,结合随机域回归模型、系列随机域的非线性检验方法、最大似然估计及贝叶斯估计方法,对我国通货膨胀率与通货膨胀不确定性的关系进行了实证分析。实证研究发现,通货膨胀率引起了通货膨胀不确定性,两者呈现非线性的U型关系,支持了Friedman假说;大的通货膨胀不确性引起通货膨胀率先升后降,呈现非线性倒U曲线关系,Cukierman-Meltzer假说在U型左侧范围内成立,于U型右侧Holland结论成立。     

基于演化理论的城市合作模式研究

传统研究城市群的整合过程,探讨城市合作的有效模式,主要采用实证分析的方法.而城市群作为一个复杂的城市系统,其演化和发展既受外部环境及其历史基础影响,也受其演化过程中各组分变化影响.同时,由于人受社会复杂性、未来不确定性及人的计算能力有限性,个体行为遵从习惯、服从规则的制约,使得人仅具有有限理性.因此,使得这种方法研究城...     

Asymmetric labor supply

The estimation of labor supply elasticities has been an important issue in the economic literature. Yet all works have estimated conditional mean labor supply functions only. The objective of this paper is to obtain more information on labor supply, estimating a conditional quantile labor supply function. We use a sample of prime age urban males employees in Brazil. Two stage estimators are used as the net wage and nonlabor income are found to be endogenous to the model. Contrary to previous works using conditional mean estimators, it is found that labor supply elasticities vary significantly and asymmetrically across hours of work. While the income and wage elasticities at the standard work week are zero, for those working longer hours the elasticities are negative.     

The theory of fiat money and private money as alternative media of exchange

A random-matching model with a clearinghouse is constructed to investigate the impact of private money on economic efficiency and social welfare in three monetary regimes. A subset of agents, called bankers, whose credit histories are recorded by the clearinghouse, are allowed to issue private banknotes in order to consume. Those private liabilities may serve as media of exchange, either by themselves, or alongside a stock of fiat money. Under certain conditions, welfare in a monetary steady state with private money is strictly higher than that attained in a steady state where private money is prohibited.