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Strong Performance (strong + performance)

Distribution by Scientific Domains
Mathematics and Statistics60%
Business, Economics, Finance and Accounting40%

Selected Abstracts

The Russian ,flat tax' reform

ECONOMIC POLICY, Issue 43 2005
Anna Ivanova
SUMMARY Russian's ,flat tax' In 2001, Russia dramatically reduced its higher rates of personal income tax (PIT), establishing a single marginal rate at the low level of 13%. In the following year, real revenue from the PIT increased by about 26%. This ,flat tax' experience has attracted much attention (and emulation), making it perhaps the most important tax reform of recent years. But it has been little studied. This paper asks whether the strong performance of PIT revenue was itself a consequence of this reform, using both macro evidence and, in particular, micro level data on the experiences of individuals and households affected by the reform to varying degrees. It concludes that there is no evidence of a strong supply side effect of the reform. Compliance, however, does appear to have improved quite substantially , by about one third, according to our estimates , though it remains unclear whether this was due to the parametric tax reform or to accompanying changes in enforcement. , Anna Ivanova, Michael Keen and Alexander Klemm [source]

Index policies for the routing of background jobs

NAVAL RESEARCH LOGISTICS: AN INTERNATIONAL JOURNAL, Issue 6 2004
K.D. Glazebrook
Abstract Arriving (generic) jobs may be processed at one of several service stations, but only when no other (dedicated) jobs are waiting there. We consider the problem of how to route these incoming background jobs to make best use of the spare service capacity available at the stations. We develop an approximative approach to Whittle's proposal for restless bandits to obtain an index policy for routing. The indices concerned are increasing and nonlinear in the station workload. A numerical study testifies to the strong performance of the index policies developed. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004 [source]

An index policy for a stochastic scheduling model with improving/deteriorating jobs

NAVAL RESEARCH LOGISTICS: AN INTERNATIONAL JOURNAL, Issue 7 2002
K.D. Glazebrook
We consider stochastic scheduling models which have the natural character that jobs improve while being processed, but deteriorate (and may possibly leave the system altogether) while processing is diverted elsewhere. Such restless bandit problems are shown to be indexable in the sense of Whittle. A numerical study which elucidates the strong performance of the resulting index policy is complemented by a theoretical study which demonstrates the optimality of the index policy under given conditions and which develops performance guarantees for the index heuristic more generally. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 706,721, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10036 [source]

Intellectual Property, Architecture, and the Management of Technological Transitions: Evidence from Microsoft Corporation

THE JOURNAL OF PRODUCT INNOVATION MANAGEMENT, Issue 3 2009
Alan MacCormack
Many studies highlight the challenges facing incumbent firms in responding effectively to major technological transitions. Though some authors argue that these challenges can be overcome by firms possessing what have been called dynamic capabilities, little work has described in detail the critical resources that these capabilities leverage or the processes through which these resources accumulate and evolve. This paper explores these issues through an in-depth exploratory case study of one firm that has demonstrated consistently strong performance in an industry that is highly dynamic and uncertain. The focus for the present study is Microsoft, the leading firm in the software industry. The focus on Microsoft is motivated by providing evidence that the firm's product performance has been consistently strong over a period of time in which there have been several major technological transitions,one indicator that a firm possesses dynamic capabilities. This argument is supported by showing that Microsoft's performance when developing new products in response to one of these transitions,the growth of the World Wide Web,was superior to a sample of both incumbents and new entrants. Qualitative data are presented on the roots of Microsoft's dynamic capabilities, focusing on the way that the firm develops, stores, and evolves its intellectual property. Specifically, Microsoft codifies knowledge in the form of software "components," which can be leveraged across multiple product lines over time and accessed by firms developing complementary products. The present paper argues that the process of componentization, the component "libraries" that result, the architectural frameworks that define how these components interact, and the processes through which these components are evolved to address environmental changes represent critical resources that enable the firm to respond to major technological transitions. These arguments are illustrated by describing Microsoft's response to two major technological transitions. [source]

Simultaneous Factor Selection and Collapsing Levels in ANOVA

BIOMETRICS, Issue 1 2009
Howard D. Bondell
Summary When performing an analysis of variance, the investigator often has two main goals: to determine which of the factors have a significant effect on the response, and to detect differences among the levels of the significant factors. Level comparisons are done via a post-hoc analysis based on pairwise differences. This article proposes a novel constrained regression approach to simultaneously accomplish both goals via shrinkage within a single automated procedure. The form of this shrinkage has the ability to collapse levels within a factor by setting their effects to be equal, while also achieving factor selection by zeroing out entire factors. Using this approach also leads to the identification of a structure within each factor, as levels can be automatically collapsed to form groups. In contrast to the traditional pairwise comparison methods, these groups are necessarily nonoverlapping so that the results are interpretable in terms of distinct subsets of levels. The proposed procedure is shown to have the oracle property in that asymptotically it performs as well as if the exact structure were known beforehand. A simulation and real data examples show the strong performance of the method. [source]