778 research outputs found

    An Almost Integration-free Approach to Ordered Response Models

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    In this paper we propose an alternative approach to the estimation of ordered response models. We show that the Probit-method may be replaced by a simple OLS-approach, called P(robit)OLS, without any loss of efficiency. This method can be generalized to the analysis of panel data. For large-scale examples with random fixed effects we found that computing time was reduced from 90 minutes to less than one minute. Conceptually, the method removes the gap between traditional multivariate models and discrete variable modelsCategorical data; Ordered probit model; Ordered response models; Subjective data; Subjective well-being

    Image and Reality: the Case of Job Satisfaction

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    This study makes a distinction between two types of utility. Experienced utility is defined as the job satisfaction derived from the present job, estimated by using a subjective evaluation of job satisfaction. Anticipated utility is defined as the individual’s anticipated job satisfaction before starting the job and it is studied by using a stated preference methodology known as conjoint analysis. The results suggest that the two utility concepts are different. Information about experienced utility is useful for the evaluation of well-being policies and the welfare effects of various employer strategies. Anticipated utility provides knowledge about the job search process.European Commission, Fifth Framework Programme "Improving Human Potential" (contract number: HPSE-CT-2002-00143)

    Happiness and Financial Satisfaction in Israel. Effects of Religiosity, Ethnicity, and War

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    We analyze individual satisfaction with life as a whole and satisfaction with the personal financial situation for Israeli citizens of Jewish and Arab descent. Our data set is the Israeli Social Survey (2006). We are especially interested in the impact of the religions Judaism, Islam and Christianity, where we are able to differentiate between individuals who vary in religiosity between secular and ultra–orthodox. We find a significant effect of religiosity on happiness. With respect to Jewish families it is most striking that the impact of family size on both life and financial satisfaction seems to vary with religiosity. This might be a reason for differentiation in family equivalence scales. For Arab families we did not find this effect. First-generation immigrants are less happy than second-generation immigrants, while there is no significant difference between second-generation families and native families. The effect of the Lebanon War is much less than expected.happiness, subjective well-being, financial satisfaction, Israel, religion, immigration, terrorism

    Vignette Equivalence and Response Consistency; The Case of Job Satisfaction

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    We compare reported job satisfaction with vignette evaluations of hypothetical jobs by using a British, Greek and Dutch data set, containing 95 randomly assigned vignettes. In order to test comparability of international data sets recently the method of anchoring vignettes has been introduced by King et al. (2004). This intuitively and attractive idea requires the properties of vignette equivalence and response consistency. In our data set both job satisfaction and vignettes are numerically evaluated on a 0-10-scale. This fact allows us to interpret the evaluations as cardinal satisfaction values and to estimate satisfaction functions for vignettes and for the own job situation. We find that both functions differ significantly: vignette evaluations appear to depend on the own job situation and other individual characteristics. Hence, without correction for those differences in background characteristics, vignette evaluations are not comparable between individuals. Similar conclusions are reached for response consistency.vignettes, vignette equivalence, response consistency, job satisfaction, subjective well-being

    Follicular wave synchronization using buserelin in llama (Lama glama)

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    The objective of the study was to synchronize follicular wave emergency using busereline in a group of llamas that were at different stages of their follicular waves. We used 16 non-pregnant, nonlactating females divided according to their follicular dynamics determined ultrasonographically three days previously, into 4 groups: I: follicles smaller than 6 mm; II: growing follicles from 7 to 10 mm; III: maturing follicles from 8 to 14 mm and IV: regressing follicles, decreasing over two consecutive days. The animals received 8 ”g of busereline (day 0) and ovarian activity was followed using ultrasound scanning until a dominant follicle (? 7 mm) was detected. The smallest mean maximum follicular diameter was observed on day 3, there being no significant differences between the 4 groups (P=0.50). The time interval from the GnRH injection to the detection of a follicle ? 7 mm was 6.25 ± 1.29 days in group I; 5.5 ± 1.8 days in group II; 5.5 ± 1.1 days in group III and 8.66 ± 1.88 days in group IV. The moment of the detection of a dominant follicle was not statistically different (P=0.26). In conclusion, the use of busereline in llamas that are in different follicular phases synchronizes the emergence of the follicular wave and permits starting superstimulatory treatments between days 3 and 6 after its injection.Fil: Ferrer, M.S. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Área de TeriogenologĂ­a. Buenos Aires, ArgentinaFil: AgĂŒero, A. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Área de TeriogenologĂ­a. Buenos Aires, ArgentinaFil: Chaves, M.G. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Área de TeriogenologĂ­a. Buenos Aires, ArgentinaFil: Russo, A.F. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Área de TeriogenologĂ­a. Buenos Aires, ArgentinaFil: Rutter, B. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Área de TeriogenologĂ­a. Buenos Aires, ArgentinaEl objetivo del estudio fue sincronizar la emergencia de la onda folicular mediante la aplicaciĂłn de buserelina, en animales que se encontraban en diferentes fases de su dinĂĄmica folicular. Se utilizaron 16 hembras vacĂ­as no en lactancia divididas en 4 grupos en base a su dinĂĄmica folicular determinada ultrasonogrĂĄficamente durante los 3 dĂ­as previos: I: folĂ­culos menores a 6 mm; II: folĂ­culos en crecimiento entre 7 y 10 mm; III: folĂ­culos en fase estĂĄtica entre 8 y 14 mm y IV: folĂ­culos en regresiĂłn luego de dos mediciones consecutivas en descenso. Los animales recibieron 8 ”g de buserelina (dĂ­a 0) y se realizĂł el seguimiento de la actividad ovĂĄrica mediante ultrasonografĂ­a hasta detectar la presencia de un folĂ­culo dominante (mayor o igual a 7 mm). El menor diĂĄmetro folicular mĂĄximo promedio en los 4 grupos se observĂł el dĂ­a 3 no existiendo diferencias significativas entre los grupos (P= 0,50). El tiempo transcurrido desde la aplicaciĂłn del anĂĄlogo de GnRH hasta la detecciĂłn de un folĂ­culo mayor o igual a 7 mm fue de 6,25 ± 1,29 dĂ­as para el grupo I; 5,5 ± 1,8 dĂ­as para el grupo II; 5,5 ± 1,1 dĂ­as para el grupo III y 8,66 ± 1,88 dĂ­as para el grupo IV. No hubo diferencias significativas en el momento de la detecciĂłn del folĂ­culo dominante (P=0,26). En conclusiĂłn la aplicaciĂłn de buserelina en llamas que se encuentran en distintas fases de su dinĂĄmica folicular, sincroniza la emergencia de la onda folicular y permite comenzar los tratamientos superestimulatorios entre los dĂ­as 3 y 6 de la aplicaciĂłn

    Analysis of aircraft fleets of U.S. major airlines since deregulation

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    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.Vita.Includes bibliographical references.by José Ferrer.M.S

    Magnetothermal Conductivity of Highly Oriented Pyrolytic Graphite in the Quantum Limit

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    We report on the magnetic field (0T≀B≀9 \le B \le 9T) dependence of the longitudinal thermal conductivity Îș(T,B)\kappa(T,B) of highly oriented pyrolytic graphite in the temperature range 5 K ≀T≀\le T\le 20 K for fields parallel to the c−c-axis. We show that Îș(T,B)\kappa(T,B) shows large oscillations in the high-field region (B > 2 T) where clear signs of the Quantum-Hall effect are observed in the Hall resistance. With the measured longitudinal electrical resistivity we show that the Wiedemann-Franz law is violated in the high-field regime.Comment: 4 Figures, to be published in Physical Review B (2003

    Hierarchical Organization in Complex Networks

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    Many real networks in nature and society share two generic properties: they are scale-free and they display a high degree of clustering. We show that these two features are the consequence of a hierarchical organization, implying that small groups of nodes organize in a hierarchical manner into increasingly large groups, while maintaining a scale-free topology. In hierarchical networks the degree of clustering characterizing the different groups follows a strict scaling law, which can be used to identify the presence of a hierarchical organization in real networks. We find that several real networks, such as the World Wide Web, actor network, the Internet at the domain level and the semantic web obey this scaling law, indicating that hierarchy is a fundamental characteristic of many complex systems

    Integration of design tools and knowledge capture into a CAD system: a case study

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    onceptual design phase is partially supported by product lifecycle management/computer-aided design (PLM/CAD) systems causing discontinuity of the design information flow: customer needs — functional requirements — key characteristics — design parameters (DPs) — geometric DPs. Aiming to address this issue, it is proposed a knowledge-based approach is proposed to integrate quality function deployment, failure mode and effects analysis, and axiomatic design into a commercial PLM/CAD system. A case study, main subject of this article, was carried out to validate the proposed process, to evaluate, by a pilot development, how the commercial PLM/CAD modules and application programming interface could support the information flow, and based on the pilot scheme results to propose a full development framework
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