A structured overview of 50 years of small-world research

This paper offers a structured overview of 50 years of small-world research. Initially formulated by Pool and Kochen in the mid-1950s, the small-world concept can be divided into six research foci, based on three dimensions (structural, process-related, psychological), and two process-related themes (diffusion, search). Building on this analytical distinction, the article provides a historical summary of the different phases of research on the small-world problem, and summarizes the empirical and theoretical progress on different facets of the small-world phenomenon. The paper concludes with a brief assessment of accomplishments and open questions, suggesting some possible future research areas.     

The work to make an experiment work

ABSTRACT

Contrary to its typical presentation in scientific publications as a certain and linear process, in reality, the experimental method, not least the design aspect of it, requires a great deal of trial-and-error and ad hoc decision-making on the part of the researchers. This uncertain and contingent aspect of research, although little known outside of the circle of experts, has important implications for our understanding of the nature of science and scientific findings.

This paper offers a backstage perspective to experiment design, where the uncertain and contingent nature of experimental research is at its starkest. It draws on insights from the sociological perspective of ethnomethodology through the auto-ethnographic first-hand experience of the first author's own social psychology experiments. Based on detailed lab notes and planning documents on how and why design changes were made, the analysis focuses on the evolution of the experiment design, particularly the researcher’s in situ practical reasoning for how to make the experiment work. From this, we show how ethno-methods shape experiment results and highlight the inseparability of social science experimentation from in situ practical reasoning.     

The Gandhi Secondary School: an experiment in Roma education

The Gandhi Secondary School, located in Pécs, Hungary, was, until recently, the only secondary school in Europe devoted to preparing young Roma for higher education. This article discusses the school's origins and philosophy, its curriculum, and its teaching models. There is also a discussion of the reality of life at the school and the various challenges faced by teachers and students.     

多媒体应用于生物化学实验教学中的优势

本文结合实践教学中的经验,总结了多媒体课件在生物化学实验中的几大优点,指出如何充分运用多媒体课件来改善生化实验课的教学效果,通过生动直观的多媒体课件内容,激发起学生的学习兴趣和激情,达到使学生形象记忆知识的目的。     

The effect of urban ground covers on arthropods: An experiment

Changes to the ground layer in urban areas are extensive, but the effects on arthropod fauna are poorly understood. We undertook a manipulative experiment to examine the response of arthropods to small-scale variation in ground covers commonly found in urban parks and gardens in Australia. The ground covers tested were bare ground, leaf litter, woodchips and grass, with plot sizes of 3.6 m². Epigeic arthropods were sampled with pitfall traps and Tullgren funnels over 12 months following establishment of the treatments. All epigeic arthropods were sorted to order and the ants (Hymenoptera: Formicidae), beetles (Coleoptera), millipedes (Diplopoda) and slaters (Isopoda: Oniscidea) were examined at lower taxonomic levels. Diverse arthropods rapidly colonised previously cleared plots in all four treatments and were most abundant in grass plots. The diversity of ants and beetles was significantly different in different ground covers and tended to be most diverse in grass plots. Despite the treatments providing very different microclimates, the fauna studied did not show strong selection for a particular cover type overall. The abundance of grass cover in the surrounding area may have led to the grass plots having the greatest abundance of arthropods. These results have important implications for developing effective small-scale conservation efforts for arthropods in anthropogenically modified landscapes, especially for species with poor dispersal abilities.     

The central Europe experiment: Looking at persons and looking at objects

Gaze at objects, another person, and background was measured for fifteen dyads which constituted five different experimental groups in which task and situational factors were varied. The findings were that background stimuli had an unreliable effect on gaze; a very simple object relevant to the subject's task attracted a great deal of gaze and greatly reduced gaze at the other person. This effect was even stronger with a complex relevant object, where visual attention was almost completely transferred from the other person to the object. There was evidence of forces to avoid too much gaze at the other person. These findings suggested the possibility of postulating some new function of gaze in addition to information-seeking, or the possibility of an explanation in terms of the approach-avoidance model of gaze (Argyle & Dean, 1965).The authors are grateful to the S.S.R.C. for financial support.     

The President's listening post: Nixon's failed experiment in government public relations

At the beginning of his first term, President Nixon engaged in an experiment to institutionalize and regularize a new channel for citizens to convey their views and ideas to the White House. He called it a President's Listening Post. The first one opened in Philadelphia to much hoopla and hopes in October 1969. Quickly, however, it became clear that the mechanism was not working as hoped. Trying to avoid political embarrassment, it was quietly shut down in early 1971. This article recounts the largely unknown experiment by the Nixon White House in presidential public relations.     

The context of employment discrimination: interpreting the findings of a field experiment

Although field experiments have documented the contemporary relevance of discrimination in employment, theories developed to explain the dynamics of differential treatment cannot account for differences across organizational and institutional contexts. In this article, I address this shortcoming by presenting the main empirical findings from a multi‐method research project, in which a field experiment of ethnic discrimination in the Norwegian labour market was complemented with forty‐two in‐depth interviews with employers who were observed in the first stage of the study. While the experimental data support earlier findings in documenting that ethnic discrimination indeed takes place, the qualitative material suggests that theorizing in the field experiment literature have been too concerned with individual and intra‐psychic explanations. Discriminatory outcomes in employment processes seems to be more dependent on contextual factors such as the number of applications received, whether requirements are specified, and the degree to which recruitment procedures are formalized. I argue that different contexts of employment provide different opportunity structures for discrimination, a finding with important theoretical and methodological implications.     

The impact of female education on fertility: a natural experiment from Egypt

This paper presents new evidence on the impact of female education on fertility in Egypt using the change in the length of primary schooling as the source of exogenous variation in education. Beginning in 1988, the Egyptian government cut the number of primary school years from six to five, moving from a 12-year system of pre-university education to an 11-year system. This policy change affected all individuals born on or after October 1977. Using triennial pooled cross-section data from 1992 to 2014 and a nonparametric regression discontinuity approach, we compare education and fertility of women born just before and right after October 1977. Our analysis shows that female education significantly reduces the number of children born per woman. The reduction in fertility seems to result from delaying maternal age rather than changing women’s fertility preferences. We also provide evidence that female education in Egypt does not boost women’s labor force participation or affect their usages of contraceptive methods. Female education, however, does appear to increase women’s age at marriage which might explain the delay of maternal age.     

The unexpected influence of physician attributes on clinical decisions: results of an experiment

This experiment was designed to determine: (1) whether patient attributes (specifically a patient's age, gender, race, and socioeconomic status) independently influence clinical decision-making; and (2) whether physician characteristics alone (such as their gender, age, race, and medical specialty), or in combination with patient attributes, influence medical decision-making. METHODS: An experiment was conducted in which 16 (= 2(4)) videotapes portraying patient-physician encounters for two medical conditions (polymyalgia rheumatica (PMR) and depression) were randomly assigned to physicians for viewing. Each video presented a combination of four patient attributes (65 years or 80 years of age; male or female; black or white; blue or white collar occupation). Steps were taken to enhance external validity. One hundred twenty-eight eligible physicians were sampled from the northeastern United States, with numbers balanced across 16 (= 2(4)) strata generated from the following characteristics (male or female; < 15 or > or = 15 years since graduation; black or white; internists or family practitioners). The outcomes studied were: 1) the most likely diagnosis; 2) level of certainty adhering to that diagnosis; and 3) the number of tests that would be ordered. RESULTS: Patient attributes (namely age, race, gender, and socioeconomic status) had no influence on the three outcomes studied (the most likely diagnosis, the level of certainty, and test ordering behavior). This was consistent across the two medical conditions portrayed (PMR and depression). In contrast, characteristics of physicians (namely their medical specialty, race, and age) interactively influenced medical decision-making. CONCLUSION: Epidemiologically important patient attributes (which Bayesian decision theorists hold should be influential) had no effect on medical decision-making for the two conditions, while clinically extraneous physician characteristics (which should not be influential) had a statistically significant effect. The validity of idealized theoretical approaches to medical decision making and the usefulness of further observational approaches are discussed.     

The efficacy of the Rio Hondo DUI court: a 2-year field experiment

This study reports results from an evaluation of the experimental Rio Hondo driving under the influence (DUI) court of Los Angeles County, California. Interviews and official record checks with 284 research participants who were randomly assigned to a DUI court or a traditional criminal court were assessed at baseline and at 24-month follow-up. The interviews assessed the impact of the DUI court on self-reported drunk driving behavior, the completion of treatment, time spent in jail, alcohol use, and stressful life events. Official record checks assessed the impact of the DUI court on subsequent arrests for driving under the influence and other drinking-related behaviors. Few differences on any outcomes were observed between participants in the experimental DUI court and those assigned to the traditional court. The results suggest that the DUI court model had little additional therapeutic or public safety benefit over the traditional court process. The implication of these findings for the popularity of specialized courts for treating social problems is discussed.     

Hungary's experiment in legalizing casual employment

Hungary's 1997 Casual Employment Act was originally meant to formalize ad hoc employment relationships entered into by private individual employers through simplified administrative procedures. After being widely abused, however, this flexible regulatory framework was eventually opened up to all employers, with a higher ceiling on the number of days workable on this basis, drastically reduced social security contributions and strong tax incentives. The aim was then to reduce unemployment and the incidence of illegal work by stretching the boundaries of formal employment, but neither of these objectives was attained. Instead, the authors argue, the attempted flexicurity has greatly increased workers' vulnerability.