DETERMINING OPTIMAL SHIFT SCHEDULES FOR TELEPHONE TRAFFIC EXCHANGE OPERATORS

A branch and bound algorithm is presented for determining the minimum number of telephone operators, and their shift schedules, required to meet demand that varies over a 24 hour operating period. An integer linear programming formulation is used, and the algorithm is described in terms of its separation, relaxation, fathoming, and branching procedures. Computational results are provided, using actual operating data. The results indicate that practical sized problems can be solved by the algorithm, involving as many as 100 different shift type variables and demand profiles typical of those encountered in many telephone traffic exchanges.     

Understanding the social and cultural bases of Brexit*

We use data from a large scale and nationally representative survey to evaluate two narratives about the social bases of Brexit. The first narrative sees Brexit as a revolt of the economically left-behinds. The second narrative attributes Brexit to the resurgence of an English nationalism. There is some, albeit not always consistent, evidence that people in relative poverty or those living in areas that have seen greater Chinese import penetration are slightly more pro-Leave. People living in economically deprived neighborhoods are not more pro-Brexit. Using the Weberian class–status distinction, it is social status, not social class, which stratifies Brexit support. Individuals for whom being British is important are more pro-Leave. But those who see themselves as British rather than English, and those reporting omnivorous cultural consumption are less supportive of Brexit. Overall, there is empirical support for both narratives. But the weight of the evidence suggests a strong cultural dimension in Brexit support.     

Longitudinal patterns of anger reactivity and risk‐taking: The role of peer‐context

The current study examined the interplay between children's dispositional anger and susceptibility to peers' influence in increasing children's risk‐taking behaviors. Participants in the current study were children from a larger study of temperament and social–emotional development who were followed across 9, 24, 36, 48, and 60 months. Dispositional anger was measured using mothers' reports across 9 and 48 months. At 60 months, children played a risk‐taking computer game in presence of an unfamiliar peer who watched the child play. The child's risk‐taking was assessed during the game as the unfamiliar peers' reactions were coded based on comments that were peer directed, reflective of praising the target child's performance, or object directed, indicative of excitement toward the game. A latent profile analysis revealed three longitudinal anger profiles across infancy to early childhood: high stable, average stable, and low stable anger. Results suggested that as peers' object‐directed comments predicted risk‐taking independent of children's anger, the association between peer‐directed comments and risk‐taking was dependent on children's dispositional anger. Specifically, when peers praised the target child's performance, children in the high stable anger profile showed increased risk‐taking propensity. Findings are discussed based on the importance of considering both temperamental characteristics and aspects of the peer context in relation to children's risk‐taking.     

Hungary: a health system in transition

Hungary has an area of 93,030 square kilometers (35,900 square miles), the size of the state of Indiana in the United States. It is landlocked by the Czech Republic and the Slovak Republic to the north, Austria to the west, Yugoslavia to the south, and Romania and the Soviet Union to the east. Although the health care system is based on the Soviet system, there have been dramatic changes since 1991, when the soviet Union and its Eastern European partners discarded their communist structures and the Soviet empire was disbanded. In this report, the current Hungarian health care system and the political structure in which it is housed will be described in terms of a key set of characteristics and their subparts. The purpose of this approach is to facilitate comparison of the Hungarian system with other national health care systems. An expanded version of this article will appear in an upcoming second edition of the College's book, International Health Care: A Framework for Comparing National Health Care Systems, by Drs. Mendoza and Henderson.     

The cost of children. Part I

Using pre-war surveys of expenditure an attempt is made to assess the effect of the addition of one or more children on the distribution of expenditure. It is found that the changes between broad groups are small. The chief effect is an increased expenditure in the larger families on food and children's clothing, compensated by reduced expenditure on luxuries and adult clothing. It is confirmed that expenditure on accommodation does not rise with family size.     

Analysis of covariance in mixed models with unequal subclass numbers

Blue of estimable linear functions and exact tests of hypotheses concerning such functions usually do not exist in the covariance model with random factors having unknown variances. This is true even in the equal subclass numbers case. This paper suggests alternative methods for finding linear unbiased estimators and presents methods for computing sampling variances which are linear functions of the unknown parameter variances. Also, higher level covariates are defined and nonestimability problems resulting from association of such covariates with fixed factors are discussed.     

Rasch Analysis of the Metacognitive Awareness Listening Questionnaire (MALQ)

A valid metacognitive awareness second language (L2) listening questionnaire is important for both researchers and teachers to facilitate the measurement of language learners’ ability to reflect on and direct their L2 learning. However, very few metacognitive awareness questionnaires have been validated, particularly in the area of L2 listening (cf., Vandergrift, Goh, Mareschal, & Tafaghodtari, 2006). The Metacognitive Awareness Listening Questionnaire (MALQ) (Vandergrift et al.) is one exception. However, very little information has been collected on the MALQ’s psychometric properties. To address this paucity, we administered the MALQ to a sample of 299 male Korean adolescent speakers of English. Using a modern measurement approach to scale validation (Rasch modeling), we found that with the exception of one subscale (Person knowledge) the subscales had good psychometric properties in that it was reliable and unidimensional.     

Analysis of longitudinal data with drop-out: objectives, assumptions and a proposal

Summary. The problem of analysing longitudinal data that are complicated by possibly informative drop-out has received considerable attention in the statistical literature. Most researchers have concentrated on either methodology or application, but we begin this paper by arguing that more attention could be given to study objectives and to the relevant targets for inference. Next we summarize a variety of approaches that have been suggested for dealing with drop-out. A long-standing concern in this subject area is that all methods require untestable assumptions. We discuss circumstances in which we are willing to make such assumptions and we propose a new and computationally efficient modelling and analysis procedure for these situations. We assume a dynamic linear model for the expected increments of a constructed variable, under which subject-specific random effects follow a martingale process in the absence of drop-out. Informal diagnostic procedures to assess the tenability of the assumption are proposed. The paper is completed by simulations and a comparison of our method and several alternatives in the analysis of data from a trial into the treatment of schizophrenia, in which approximately 50% of recruited subjects dropped out before the final scheduled measurement time.