The properties of asymmetric unit root tests in the presence of mis-specified asymmetry

The seminal analysis of Enders and Granger (1998) is extended to examine the properties of asymmetric unit root tests when the nature of the actual asymmetric adjustment process underlying the observed data is unknown. The analysis is further extended by considering joint testing for asymmetric stationarity in addition to unit root testing. It is shown that the momentum-threshold autoregressive (MTAR) test outperforms the threshold autoregressive (TAR) test. The results indicate that when employing asymmetric unit root tests, practitioners will tend to detect asymmetry of an MTAR rather TAR nature, irrespective of the form of asymmetry actually present in the data.Asymmetry

Performance evaluation in teaching: Dissecting student evaluations in higher education

Numerous studies have highlighted the significant role of Student Evaluations of Teaching (SETs) as a key metric for assessing teaching quality in Higher Education (HE). Building upon these insights, our study introduces an innovative four-tiered model, derived from diverse research, to examine the reliability of SETs. This model addresses biases associated with SETs, delving into both statistical anomalies and cognitive biases, with particular emphasis on often-overlooked hidden context and timing factors. We reveal that these biases can distort SET scores, leading to potentially inaccurate representations of both individual and comparative academic performances. The implications of our research are significant for those influencing HE policy-making and performance evaluation. We echo previous calls for a more expansive approach to teaching effectiveness, essential for genuine insight into teaching quality. By adopting this perspective, HE can design better-informed strategies, ensuring policies and practices reflect the diverse nature of teaching excellence

Ares Launch Vehicles Overview: Space Access Society

America is returning to the Moon in preparation for the first human footprint on Mars, guided by the U.S. Vision for Space Exploration. This presentation will discuss NASA's mission, the reasons for returning to the Moon and going to Mars, and how NASA will accomplish that mission in ways that promote leadership in space and economic expansion on the new frontier. The primary goals of the Vision for Space Exploration are to finish the International Space Station, retire the Space Shuttle, and build the new spacecraft needed to return people to the Moon and go to Mars. The Vision commits NASA and the nation to an agenda of exploration that also includes robotic exploration and technology development, while building on lessons learned over 50 years of hard-won experience. NASA is building on common hardware, shared knowledge, and unique experience derived from the Apollo Saturn, Space Shuttle, and contemporary commercial launch vehicle programs. The journeys to the Moon and Mars will require a variety of vehicles, including the Ares I Crew Launch Vehicle, which transports the Orion Crew Exploration Vehicle, and the Ares V Cargo Launch Vehicle, which transports the Lunar Surface Access Module. The architecture for the lunar missions will use one launch to ferry the crew into orbit, where it will rendezvous with the Lunar Module in the Earth Departure Stage, which will then propel the combination into lunar orbit. The imperative to explore space with the combination of astronauts and robots will be the impetus for inventions such as solar power and water and waste recycling. This next chapter in NASA's history promises to write the next chapter in American history, as well. It will require this nation to provide the talent to develop tools, machines, materials, processes, technologies, and capabilities that can benefit nearly all aspects of life on Earth. Roles and responsibilities are shared between a nationwide Government and industry team. The Exploration Launch Projects Office at the Marshall Space Flight Center manages the design, development, testing, and evaluation of both vehicles and serves as lead systems integrator. A little over a year after it was chartered, the Exploration Launch Projects team is testing engine components, refining vehicle designs, performing wind tunnel tests, and building hardware for the first flight test of Ares I-X, scheduled for spring 2009. The Exploration Launch Projects team conducted the Ares I System Requirements Review (SRR) at the end of 2006. In Ares' first year, extensive trade studies and evaluations were conducted to refine the design initially recommended by the Exploration Systems Architecture Study, conceptual designs were analyzed for fitness, and the contractual framework was assembled to enable a development effort unparalleled in American space flight since the Space Shuttle. Now, the project turns its focus to the Preliminary Design Review (PDR), scheduled for 2008. Taking into consideration the findings of the SRR, the design of the Ares I is being tightened and refined to meet the safety, operability, reliability, and affordability goals outlined by the Constellation Program. The Ares V is in the early design stage, focusing its activities on requirements validation and ways to develop this heavy-lift system so that synergistic hardware commonality between it and the Ares I can reduce the operational footprint and foster sustained exploration across the decades ahead

Adaptive Governance: An Introduction and Implications for Public Policy

Adaptive governance is a concept from institutional theory that deals with the evolution of institutions for the management of shared assets, particularly common pool resources and other forms of natural capital. This paper is the first of a set of four papers on adaptive governance, providing a brief overview of the history of the concept, the distinguishing features of the literature, and key insights provided for economists and policy advisors. We argue that adaptive governance provides an interesting lens for examining the political economy of policy responses akin to the concept of market failure within economics, but applied to wider processes of social learning and collective choice, including collective choices about the scope and structure of institutions that govern lower level choices by individuals and organizations.adaptive governance, public policy, common pool resources, natural resource management, wicked problems, Institutional and Behavioral Economics,

A feasibility study in rearchitecting UML as a family of languages using a precise OO meta-modeling approach.

This report describes a feasibility study in rearchitecting UML. It develops a theory of precise OO meta-modeling in order to fulfil this task, and checks the feasibility of that theory by developing the meta-model of various aspects of UML

Death of the pedagogue: pluralism and non-didacticism

Contest and controversy; orthodoxy and heterodoxy; critique and reject: how can economics curricula be adjusted to illustrate the multiplicity of, frequently antagonistic, explanations for observed phenomena? This paper commences by addressing the meaning of pluralism within the rubric of Foucault and Barthes, proposing that the application of pluralism in economics is a more complex process than has previously been acknowledged. It posits that the emphasis falls too often on pedagogical issues that re-affirm hierarchical teacher-learner relationships which hinder learner autonomy and encourages the transmission of teacher bias. Arguing that the economics instructor should instead act as an enlightened navigator, it addresses the practical aspects of delivery by exploring two key modules in undergraduate degree provision: intermediate microeconomics and the dissertation

Value stream mapping of information system activities

Industries and organizations struggle to remain viable and competitive. Toyota Motor Company developed Lean Thinking and its continuous incremental improvement of processes through relentless settings, businesses benefit from applying lean prinicples to their organizations. This paper presents an overview of lean methodologies with a focus on Value Stream Mapping (VSM). It discusses the benefits that might be realized when an IS organization supports lean methods and shows how VSM can play an important function in evaluating current and future Information System processes