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1.
Models for which the MLE and the conditional MLE coincide 总被引:1,自引:0,他引:1
The MLE, CMLE and MMLE coincide in a linear regression model with fixed individual effects. In this case, there is no incidental parameters problem and the MLE is consistent. The equivalence of these estimators is important because CMLE=MLE implies both the consistency of the MLE and the efficiency of the CMLE. In general, we cannot expect to find a CMLE or MMLE, since there may be no fixed-dimension sufficient statistic for the effects, nor an appropriate transformation of the data whose distribution does not depend on the effects. However, we show that the MLE, CMLE and MMLE do coincide in systems of seemingly unrelated regressions and in systems of simultaneous equations. We establish this result for systems in which (exogenous) variables in addition to (or other than) the intercept may have coefficients which vary over individuals, provided that the set of such variables is the same in every equation.The financial support of the National Science Foundation is gratefully acknowledged. 相似文献
2.
T. Bettina Cornwell Stephen W. Pruitt John M. Clark 《Journal of the Academy of Marketing Science》2005,33(4):401-412
This study presents analysis of the impact of “official product” sports sponsorships with the National Football League (NFL),
Major League Baseball (MLB), the National Hockey League (NHL), the National Basketball Association (NBA), and the Professional
Golfers Association (PGA) on the stock prices of sponsoring firms. The primary finding of the study is that, in the main,
announcements were accompanied by increases in shareholder wealth. The 53 sponsors analyzed experienced mean increases in
stock valuations of about $257 million. A multiple regression analysis of firm-specific stock price changes and selected corporate
and sponsorship attributes indicates that official product sponsorships with the NBA, NHL, and PGA and those with smaller
market shares were associated with the largest gains in share prices. Although corporate cashflow (a proxy for agency conflicts)
is statistically unrelated to shareholder approval, sponsorships by high-technology companies were associated with stronger
stock price reactions than otherwise. Finally, product congruence with the sponsored sport was positively related to changes
in stock prices.
T. Bettina Cornwell (b.cornwell@business.uq.edu.au) is Professor of Marketing and Leader of the Marketing cluster in the UQ Business School at
the University of Queensland, Australia. She was formerly Professor of Marketing in the Fogelman College of Business and Economics
at the University of Memphis. She received her Ph.D. from the University of Texas. Her research focuses on promotion and consumer
behavior, especially with regard to international and public policy issues. Other articles on the topic of sponsorship-linked
marketing have recently appeared in theJournal of Advertising, the Journal of Advertising Research, theJournal of Business Research, andPsychology & Marketing.
Stephen W. Pruitt (pruittst@umkc.edu) is the holder of the Arvin Gottlieb/Missouri Endowed Chair of Business Economics and Finance in the Henry
W. Bloch School of Business and Public Administration at the University of Missouri-Kansas City. He received his Ph.D. from
Florida State University. He has published more than 45 articles, most of which employ event study methodologies, in journals
such as theJournal of Finance, theJournal of Political Economy, Financial Management, theJournal of Public Policy and Marketing, and theJournal of Advertising Research.
John M. Clark (clarkj@cba.usm.edu) is an assistant professor of finance at the University of Southern Mississippi. He received his Ph.D.
from the University of Alabama. His research interests include options and other derivatives, investments, and the impact
of real events upon the stock prices of corporations. His work has appeared in scholarly outlets such as theJournal of Advertising Research, theFinancial Review, and theJournal of Business Ethics. 相似文献
3.
Cornwell R 《Employee benefits journal》2001,26(2):18-21
The process of integrating health and welfare plans during an M&A is challenging. At the same time, it can be exciting and possibly even desirable for the growth of a benefits plan. An M&A can be the vehicle for ushering in changes that would not be possible under the current employers' plans. It gives additional leverage with vendors. It may supply the momentum to clear up nagging problems or to address underlying benefits concerns. 相似文献
4.
This paper breaks new ground by revealing and conceptualizing the marketization of science as a process that transforms scientific discoveries and markets through a series of choreographed contestations: moments of valuation that occur when different social worlds collide. We follow a scientific discovery, from the moment it entered an incubator, to uncover how valuation practices and market devices enact and contest diverse social values (i.e., what is worth doing) to generate economic value (i.e., what is worth paying for) at the science‐market‐entrepreneurship nexus. In contrast with commercialization of science studies that focus on institutional arrangements, this study explicates the practices and devices used by multiple market actors to transform a scientific discovery into a marketable object. In so doing, we characterise choreographed contestations and the mechanisms through which they operate to explain how specific valuations are performed to work out innovative next steps that unfold the marketization of science. 相似文献
5.
abstract Firms are confronted with the challenge of learning how to develop and manage supply networks, which reduce their operating costs and maximize their effectiveness in the marketplace. In pursuit of such goals they are increasingly turning to the use of dynamic business models. Dynamic business models represent continuous change and therefore make firms learn constantly new and better ways of doing things. These changes are manifestations of inter-firm knowledge transfer. The aim of this research is to explore dynamic business models as an example of inter-firm knowledge transfer. Adopting a case study approach, we examine three components of dynamic business models – network structure, inter-firm routines and knowledge forms – and describe their integration through a problem solving approach to building an offshore supply network. Our empirical findings suggest that dynamic business models help organizations identify and link key actors with each other (at the firm and individual level), and aid the identification and specification of appropriate knowledge types and knowledge transfer mechanisms for different actors, in different contexts. 相似文献
6.
David Guest William Brown Riccardo Peccei Katy Huxley 《Industrial Relations Journal》2008,39(2):124-152
In the late 1990s, partnership at work was embraced with some enthusiasm by a number of stakeholders in employment relations and incorporated in the 1999 Employment Relations Act. The implementation of the Information and Consultation Regulations has also been extensively signalled. We might therefore expect to see some evidence of partnership‐related practices in Britain. The 2004 Workplace Employment Relations Survey (WERS 2004) provides an opportunity to explore the extent of partnership practice, and also, for the first time, to explore its link to trust relations. This article reports evidence from WERS 2004 suggesting that partnership practice remains relatively undeveloped and that it is only weakly related to trust between management and employee representatives and to employees’ trust in management. Direct forms of participation generally have a more positive association with trust than representative forms. There is also modest evidence that trust may be associated with certain workplace outcomes. The case for partnership and more particularly representative partnership as a basis for mutuality and trust is not supported by this evidence. 相似文献
7.
In this paper, we propose an alternative econometric framework for estimating and decomposing productivity change that does not require a distribution for inefficiency or the uncorrelatedness between inefficiency and the regressors. We develop our methodology for the input-oriented radial measure of productivity change and establish that this equals the negative of the time change in the log cost function. Our econometric framework is based on a fixed-effects, multiple-output cost frontier, where we decompose productivity change into discrete shifts in the frontier and changes in firm efficiency levels relative to the frontier. We also show that the standard non-frontier specification is nested within our frontier model and thus can produce different estimates of productivity change. Using a panel of twelve US railroads from 1951 to 1975, our estimated cost frontier suggests average annual productivity growth of roughly 0.3 percent, with efficiency change rising then falling over the period. Specification tests reject the non-frontier model, which yields smaller gains in productivity. 相似文献
8.
Title sponsorships are often considered the crown jewels of sports sponsorship programs. Garnering top media coverage, title
sponsorships are prized for both generating brand/product awareness and building image for their sponsors. Not surprisingly,
the rising cost of title sponsorships has led some managers to question their underlying value. Accordingly, this study presents
an analysis of the impact of 114 title sponsorship announcements of professional tennis and golf tournaments (both men’s and
women’s), auto racing (NASCAR), and college bowl games on the stock prices of sponsoring firms. Overall, the results of the
study suggest that title sponsorships are generally signed at market-clearing prices. Thus, companies undertaking title sponsorships
typically receive exactly what they pay for—except in the case of NASCAR races (which show evidence of increases in share
prices). Splitting the sample into new and renewing sponsorships generates results which differ dramatically by sport. Finally,
a cross-sectional regression finds congruence of sport and sponsor, sponsorship by high tech firms and sponsorships by large
firms all correlated with perceived sponsorship success. 相似文献
9.
10.
This study develops a pedagogy for the teaching of ethical principles in information systems (IS) classes, and reports on an empirical study that supports the efficacy of the approach. The proposed pedagogy involves having management information systems professors lead questioning and discussion on a list of ethical issues as part of their existing IS courses. The rationale for this pedagogy involves (1) the maturational aspects of ethics, and (2) the importance of repetition, challenge, and practice in developing a personal set of ethics. A study of IS ethics using a pre-post test design found that classes receiving such treatment significantly improved their performance on an IS ethics questionnaire.
It appears to me that in Ethics, as in all other philosophical studies, the difficulties ... are mainly due to ... the attempt to answer questions, without first discovering precisely what question it is which you desire to answer.
George Edward Moore, Principia Ethica [1903], preface.
Eli Cohen is an associate professor of Management Information Systems at Bradley University, Peoria, Illinois. He received his Ph.D. from Indiana University and holds CDP, CCP, CSP and CDE certificates. He is also Midwest Editor for Government Technology Magazine.Larry Cornwell is professor of Business Management and Administration at Bradley University, Peoria, Illinois. He is the recipient of the 1988 Midwest Grain Teaching Award and has extensive consulting experience to industry. He received his Ph.D. from the University of Missouri at Rolla. He has numerous publications in statistics, mathematical programming, computer science and information systems. 相似文献