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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 53 (1994), S. 175-197 
    ISSN: 1572-9338
    Keywords: Variance reduction ; simulation ; control variates ; importance sampling ; common random numbers ; stratification ; conditioning ; efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper provides an overview of the five most commonly used statistical techniques for improving the efficiency of stochastic simulations: control variates, common random numbers, importance sampling, conditional Monte Carlo, and stratification. The paper also describes a mathematical framework for discussion of efficiency issues that quantifies the trade-off between lower variance and higher computational time per observation.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 2 (1984), S. 229-238 
    ISSN: 1572-9338
    Keywords: Trends ; efficiency ; technology ; energy ; productivity ; alternatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The paper discusses long-term trends in relationships between energy use and the overall productive efficiency of the American economy. While total energy consumption grew strongly during the twentieth century, the intensity of energy use (i.e. the energy/GNP ratio) fell persistently much of the time. Thus, there were simultaneous long-term improvements in labor productivity, total factor productivity,and energy productivity. The historical record appears to be at odds with conventional beliefs that gains in productive efficiency depend upon the rising intensity of energy use in production processes. A key role in bringing about these counter-intuitive results is assigned to what is referred to as the energy-technology-productivity nexus, in which the quality of particular energy forms such as electricity and liquid fuels (along with closely linked changes in energy-using technologies) played a critical part in leveraging the overall efficiency of production. As a result of these energy form-dependent improvements in productive efficiency, outputs grew more rapidly than all inputs, including the inputs of energy. The more recent past stands in sharp contrast to the long-term record. While energy efficiency (as measured by energy/GNP) showed strong gains during the late 1970's and early 1980's, the growth in overall productive efficiency was severely retarded. Implications for the future of suggested linkages between the quality of particular energy forms and technological progress are considered.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 67 (1996), S. 117-139 
    ISSN: 1572-9338
    Keywords: Reimbursement ; efficiency ; hypothesis ; cost pass-through ; hospitals ; data envelopment analysis ; non-discretionary factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In both the private and public sectors, it is strongly believed that when goods and services are transferred at full cost, efficiency of operation is not encouraged. A cost pass-through payment mechanism, heavily used by the U.S. Federal Government prior to 1983 to reimburse hospitals for in-patient services, has been blamed for part of the annual double digit escalation in health care costs from 1965 to 1983. A cost pass-through formula is still in use for some types of outpatient care reimbursement (especially clinics and ancillary services); additionally retrospective reviews are still used to determine Medicare “outlier” payments under the present prospective system. Finally some private health care plans still utilize a mixed retrospective/prospective payment system. Hence, the issue is still very relevant to health care professionals. Unfortunately it has been difficult to settle this issue empirically since hospitals are characterized by the provision of multiple services, with no clear resource/product allocations; additionally different client mixes and other uncontrollable factors complicate the issue of measurement of efficiency. We provide some quantitative insights into this issue, using a new formal hypothesis testing procedure developed by Banker (1993) which uses asinputs the technical efficiency ratings from a Data Envelopment Analysis with non-discretionary factors (see Banker and Morey (1986)). The data set involved is for 105 North Carolina hospitals, operating in 1978 (before the era of prospective reimbursement); three distinct outputs, three controllable resources and six descriptors of the hospital (bed size, case mix, etc.) are available for each hospital. Additionally thepercent ofeach hospital's total reimbursement, generated utilizing the cost pass-through formula, was estimated. The hypotheses tested related generally to whether or not an inverse relationship existed between the hospital's inefficiency rating and the extent of its cost pass-through reimbursement. The data supports the widely held belief that hospitals with higher cost pass-through percent reimbursement indeed tended to be less efficient.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 97 (2000), S. 379-388 
    ISSN: 1572-9338
    Keywords: data envelopment analysis ; efficiency ; long-run ; short-run
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The usual Data Envelopment Analysis (DEA) model for measuring the relative efficiency assumes that all plants belong to distinct firms superior to them. For firms with more than one plant, Koopmans proposes a procedure for deriving the short-run production frontier for each firm. Modifying his idea, a DEA model is constructed in this paper for measuring the short-run efficiency of each plant within a firm. Based on the theory of production economics that the long-run production frontier is an envelop super-imposed upon all short-run production frontiers, another DEA model is constructed to measure the long-run efficiency of every plant. The long-run efficiency is always smaller than or equal to the short-run efficiency. Consequently, it is possible that an inefficient plant can only be improved in the long-run. With the models constructed in this paper, a decision-maker is able to distinguish between what can be achieved in the short-run and what in the long-run. To clarify the idea, an example of Taiwan forests is adopted for illustration.
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  • 5
    ISSN: 1572-9338
    Keywords: Data Envelopment Analysis ; weights restrictions ; value judgements ; efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper provides a review of the evolution, development and future research directions on the use of weights restrictions and value judgements in Data Envelopment Analysis. The paper argues that the incorporation of value judgements in DEA was motivated by applications of the method in real life organisations. The application driven development of the methods has led to a number of different approaches in the literature which have inevitably different uses and interpretations. The paper concentrates on the implications of weights restrictions on the efficiency, targets and peer comparators of inefficient Decision Making Units. The paper concludes with future research directions in the area of value judgements and weights restrictions.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 73 (1997), S. 253-276 
    ISSN: 1572-9338
    Keywords: Data Envelopment Analysis ; game theory ; efficiency ; linear programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Dominant Competitive Factors, unique solutions to a new class of two-person ratio efficiency games, are introduced as a means for distinguishing exceptional aspects of individual performance. The vectors of input-output multipliers thus obtained may be analyzed collectively so that commonalities within groups and differences across groups may be discovered. The method is applied to "Program Follow-Through", the original impetus for developing Data Envelopment Analysis. Our results are compared with those of the earlier study, whereupon substantial new insights are obtained.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of value-based management 11 (1998), S. 9-17 
    ISSN: 1572-8528
    Keywords: circadian ; flextime ; memory ; productivity ; time-of-day ; rhythm ; preference ; stress ; efficiency ; Zeitgeber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Each human being has an internal timekeeping mechanism. To date, over 100 so-called ‘circadian’ rhythms have been detected. Perhaps the most significant is body temperature. There is an apparent connection between this rhythm and the efficiency with which we do things in the course of the working day. Within individuals, patterns have been discovered which give credence to the popular notions of a ‘morning’ or an ‘afternoon’ person, and so on. Our memory changes from morning to afternoon: short-term memory is stronger in the morning, and long-term memory stronger in the afternoon; in schools, ‘morning’ students have higher grades than students who have other time-of-day preferences. Therefore, a strong case can be made in support of flexible time schedules. It is reported that productivity went up on the introduction of such a scheme. Employee stress has been seen to decline also. When flextime was offered, parents with small children took advantage of the benefit as well as unmarried employees. The only drawback is ensuring that, with so many individual variations in preferences, the needs of the company are fully met. If such a scheme can be devised, however, the research suggests that productivity and efficiency will increase.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of productivity analysis 5 (1994), S. 215-228 
    ISSN: 1573-0441
    Keywords: nonprofits ; volunteer labor ; donations ; efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract The purpose of this article is to explain the cross-sectional variation in money donations to charities at the organizational level. Using a unique data base which includes volunteer labor data, this article tests the hypotheses that money donations are positively related to volunteering and the technical efficiency of the firm. Technical efficiency is measured by a number of non-parametric indices. The empirical results indicateinter alia that the more technically efficient the charity, the more money donations it is able to raise. Moreoer, at least for one model, money donations and volunteering are found to be complementary at the organizational level. In addition, the results in this article are not consistent with the well-known hypothesis that government financing crowds out private donations.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of productivity analysis 8 (1997), S. 461-475 
    ISSN: 1573-0441
    Keywords: Stochastic production frontiers ; technical change ; efficiency ; Turkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Technical progress and production efficiency are central to economic growth and international competitiveness. However, these topics received little attention in Less Developed Countries. This study is the first attempt to measure and to understand the extent and importance of technical progress and efficiency in Turkish manufacturing industries. Stochastic production frontiers for Turkish textile, cement, and motor vehicles industries are estimated by using panel data of plants for the years 1987 to 1992. The rate and direction of technical change for each industry are estimated by introducing time-dependent variables in the production function. Sector-specific factors which influence technical efficiency of manufacturing plants are also identified.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of productivity analysis 12 (1999), S. 211-231 
    ISSN: 1573-0441
    Keywords: DEA ; efficiency ; regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Rewarding regulated firms based on their relative performance requires benchmarks that reflect how performance is affected by regulation. This paper demonstrates how parametric and nonparametric efficiency measures can be employed to produce benchmarks that account for the effects of regulation. We apply measurement techniques to an eleven-year panel of 20 U.S. interstate natural gas transmission companies and use our benchmarking measures to distinguish firms that perform well owing to a superior management of technology from firms that perform well owing to the effective management of the regulatory mechanism.
    Type of Medium: Electronic Resource
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