778 research outputs found
An Almost Integration-free Approach to Ordered Response Models
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
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 individualâs 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
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 ultraâorthodox. 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
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)
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. Ărea de TeriogenologĂa. Buenos Aires, ArgentinaFil: AgĂŒero, A. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Ărea de TeriogenologĂa. Buenos Aires, ArgentinaFil: Chaves, M.G. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Ărea de TeriogenologĂa. Buenos Aires, ArgentinaFil: Russo, A.F. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Ărea de TeriogenologĂa. Buenos Aires, ArgentinaFil: Rutter, B. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Ărea 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
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
We report on the magnetic field (0TT) dependence of the
longitudinal thermal conductivity of highly oriented pyrolytic
graphite in the temperature range 5 K 20 K for fields parallel to
the axis. We show that 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
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
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 â functional requirements â key characteristics â design parameters (DPs) â 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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