Race,gender, and marriage: destination selection during the great migration

Using historical census microdata, we present a unique analysis of racial and gender disparities in destination selection and an exploration of hypotheses regarding tied migration in the historical context of the Great Migration. Black migrants were more likely to move to metropolitan areas and central cities throughout the period, while white migrants were more likely to locate in nonmetropolitan and farm destinations. Gender differences were largely dependent on marital status. Consistent with the "tied-migration" thesis, married women had destination outcomes that were similar to those of men, whereas single women had a greater propensity to reside in metropolitan locations where economic opportunities for women were more plentiful.     

Oecd Social Indicators for 2001: a Critical Appraisal

The OECD social indicators for 2001 were critically reviewed by analysing their interrelationships across all OECD countries during the late 1990s. First, findings were provided covering the underlying structure of subsets of indicators by similarity in content as suggested by the OECD. Second, an analysis of the selected key indicators yielded five social dimensions, which were interpretedas conceptual constructs underlying the set of OECDsocial indicators at the level of the entire OECD area. Third, the relationships of each indicator withthese social dimensions were observed to aid choosing of appropriate indicators for making and evaluating social policies. Fourth, the OECDcountries were ranked according to their overall social welfare, as defined by the OECD social indicators, basedon the scores of the countries on the social dimensions. Fifth, similarities among the OECD countries were examined and it was found that the countries formed six bipolar country dimensions. The findings showed that an easily interpretable structure underlies the OECD social indicators. The paper clarified the use of the OECD social indicators for 2001 as a tool for planning and decision-making and for cross-national analyses of social policies.     

Application of an Irt Polytomous Model for Measuring Health Related Quality of Life

Background: The Item Response Theory (IRT) has advantages for measuring Health Related Quality of Life (HRQOL) as opposed to the Classical Tests Theory (CTT). Objectives: To present the results of the application of a polytomous model based on IRT, specifically, the Rating Scale Model (RSM), to measure HRQOL with the EORTC QLQ-C30. Methods: 103 terminal cancer patients cared for by the home services of the Servicio Andaluz de Salud (Andalusian Health Service) (Andalusia, Spain) participated. These patients responded to the adapted Spanish version of the EORTC QLQ-C30. The application was carried out individually in the patients’ homes. Results: The results show that there is an adequate global fit between the data and the IRT model applied. The analysis of the items shows that for 31 of the 33 items there is a good fit. The items which measure the general perception of health and the perception of quality of life present a lack of fit. The study of the response categories of the items (by means of Category Probability Curves) indicates that all the alternatives work extremely well. Conclusions:The EORTC QLQ-C30 presents good metric qualities, under the RSM, ratifying the feasibility to measure HRQOL already shown in other studies carried out with CTT.     

Index of Authors Volume 67, 2004

Authors Index

Index of Authors Volume 67, 2004     

Overwintering ecology of two social halictine bees,Lasioglossum duplex andL. problematicum

Summary Overwintering of two social halictine bees,Lasioglossum duplex (Dalla Torre) andL. problematicum (Blüthgen), was studied. InL. duplex many females stay near the old nests, each female preparing a hibernaculum separated from the natal nest. InL. problematicum most females overwinter communally within the natal nest. This difference in overwintering habits relates to the social structure in the next spring.L. duplex is nearly always solitary in spring although later becoming eusocial, whereas many nests ofL. problematicum are polygynous, beginning in early spring.L. duplex overwinters much deeper ( ) in the soil than doesL. problematicum ( ), but both species are safe from drops in soil temperature, which is above 0°C even in midwinter, and the bees' supercooling points are lower than −6°C. This cold resistance and the storage of sufficient food in the crop are reflected in the winter survival, which is much higher (79%) than the rate of successful nests in the spring active phase (25%). Bionomics of the eusocial halictine beeLasioglossum duplex VII. Contribution No. 2654 from the Inst. Low Temp. Sci.     

A generalization of Macula’s disjunct matrices

As a generalization of the novel construction of disjunct matrices by Macula (Discrete Math. 162:311–312, 1996), we construct a new family of disjunct matrices and discuss its error-tolerant property.     

Optimal semi-online algorithm for scheduling with rejection on two uniform machines

In this paper we consider a semi-online scheduling problem with rejection on two uniform machines with speed 1 and s≥1, respectively. A sequence of independent jobs are given and each job is characterized by its size (processing time) and its penalty, in the sense that, jobs arrive one by one and can be either rejected by paying a certain penalty or assigned to some machine. No preemption is allowed. The objective is to minimize the sum of the makespan of schedule, which is yielded by all accepted jobs and the total penalties of all rejected ones. Further, two rejection strategies are permitted thus an algorithm can propose two different schemes, from which the better solution is chosen. For the above version, we present an optimal semi-online algorithm H that achieves a competitive ratio ρ _H (s) as a piecewise function in terms of the speed ratio s.     

Kapitalmarktorientierte Unternehmensbewertung bei asymmetrischer Besteuerung von Soll- und Habenzinsen

Drukarczyk and Lobe argue that the value of a company depends on individual preferences for leveraged or unleveraged companies if debt and credit interest rates after personal taxes differ. Consequentially they derive two preference-dependent valuation formulas. Based on these results an increasing amount of literature proposing preference-dependent valuation formulas emerged. We claim that this has to be viewed critically. In order to show that even in a world of different debt and credit interest rates after personal taxes a market value can be determined we develop a new version of the Tax CAPM. Based on this model the market value of leveraged and unleveraged companies is derived. Finally we show that the corresponding valuation function significantly differs from the preference-dependent valuation formulas.