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21.
Data from the Panel Study of Income Dynamics and three decennial US censuses are used to examine the influence of metropolitan-area characteristics on black and white households’ propensity to move into poor versus nonpoor neighborhoods. We find that a nontrivial portion of the variance in the odds of moving to a poor rather to a nonpoor neighborhood exists between metropolitan areas. Net of established individual-level predictors of inter-neighborhood migration, black and white households are more likely to move to a poor or extremely poor tract rather than to a nonpoor tract in metropolitan areas containing many poor neighborhoods and a paucity of recently-built housing in nonpoor areas. Blacks are especially likely to move to a poor tract in metropolitan areas characterized by high levels of racial residential segregation and in which poor tracts have a sizeable concentration of blacks. White households are more likely to move to a poor than to a nonpoor tract in metropolitan areas that have comparatively few African Americans. 相似文献
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Brener Nancy D.; Eaton Danice K.; Kann Laura; Grunbaum Jo Anne; Gross Lori A.; Kyle Tonja M.; Ross James G. 《Public opinion quarterly》2006,70(3):354-374
This study examined whether the prevalence of self-reportedhealth risk behaviors among high school students varied by surveysetting (school versus home) and mode of administration (paperand pencil versus computer). Students in grades 9 and 11 wereassigned randomly to one of four conditionsschool paper-and-pencilinstrument (PAPI), school computer-assisted self-interview (CASI),home PAPI, and home CASI. During the spring of 2004, 4,506 studentscompleted identically worded questionnaires based on the YouthRisk Behavior Survey questionnaire. Logistic regression analysescontrolling for sex, grade, and race/ethnicity revealed thatsetting was associated significantly with the reporting of 30of the 55 risk behaviors examined, and mode was associated significantlywith the reporting of 7 of the 55 behaviors. For all behaviorswith a significant setting main effect, the odds of reportingthe behavior were greater among students who completed questionnairesat school than among students who completed questionnaires athome. For all behaviors with a significant mode main effect,PAPI mode students had lower odds of reporting the behaviorthan CASI mode students. Because social measurement researchassumes that higher prevalence estimates are more valid thanlower estimates, methodological factors shown to increase estimates,such as setting and mode, should be considered when planningsurveys. 相似文献
24.
Despite their relative invisibility, deaf people have a well established position in our special education and social services. They are a group to be cared for. Yet they have not always been like that nor do we believe they should be seen only in this light. This paper examines how social pressures have acted on deafness in work, in education, in the professionalisation of services, have impinged on deaf people themselves, and have created a misunderstood and under-estimated minority. We consider the current situation of deaf people in terms of their lack of power, the new emergence of their language and culture and the use of signing in education. All of these aspects highlight the need to reconsider our treatment of deaf people and the paper encourages some self-examination of professional roles. 相似文献
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Tarpenning KM Hawkins SA Marcell TJ Wiswell RA 《Journal of aging and physical activity》2006,14(1):3-11
Quadriceps strength and mass peak in the third decade of life, plateau, and then decline from the fifth decade on. To examine the influence of chronic endurance training and age on lean mass and leg strength, women runners (n = 62, age 43-69 years) and sedentary participants (n = 33, age 43-66 years) were divided into 40-, 50-, and 60-year age groups. Absolute isokinetic concentric torque did not differ between runners and sedentary women (97.9 +/- 19.5 and 104.6 +/- 22.7 N . m, respectively, p = .18) but was different between age groups independent of exercise status (107.6 +/- 18.4, 97.1 +/- 19.9, and 90.1 +/- 21.4 N . m, for 40s, 50s, and 60s, respectively, p < .05). Lean body mass also differed by age group (p < .05) but did not change differently among runners and sedentary women. These findings suggest that chronic endurance training might not influence the loss of muscle mass and muscle strength that occur with aging. 相似文献
27.
Kyle T. Mays 《Cultural Studies》2019,33(3):460-479
ABSTRACTContemporary Detroit has gone through many changes – or so it appears. From streets lined with vehicles made by Chrysler, Ford, and General Motors and driven by the nearly 2 million people who called the city home in 1950 to certain parts of the city looking like ghost towns; from a population that dwindled to 670,000 to the revival of downtown. Yet, what has been remarkably consistent is the invisibility of the Motor City’s Indigenous population. Indeed, Indigenous erasure, combined with rhetoric and policies that continue to marginalize and subjugate African Americans in Detroit, create a place rooted in multiple colonialisms. This essay examines how Detroit’s Indigenous Hip Hop artists resist settler colonialism through art, creativity, and culture as well as the practices of Detroit 2.0, a rhetoric and policy used by Detroit elites to reimagine it as a place of opportunity. By making visible the connections between blackness and indigeneity, as well as by linking the struggle of colonized peoples in Detroit to those in Palestine, Indigenous artists are not only asserting their humanity and challenging the longstanding idea of their erasure, but also constructing pathways for artists and activists to disrupt the effects of multiple colonialisms that continue to marginalize people of colour in urban areas. Detroit’s Indigenous Hip Hop artists make socially conscious music and also participate as activists in the city of Detroit. They serve as a window onto contemporary Indigenous identity, represent an exemplar of the urban Indigenous experience, and combine activism with art in a variety of ways. 相似文献
28.
Many models have been proposed that relate failure times and stochastic time-varying covariates. In some of these models, failure occurs when a particular observable marker crosses a threshold level. We are interested in the more difficult, and often more realistic, situation where failure is not related deterministically to an observable marker. In this case, joint models for marker evolution and failure tend to lead to complicated calculations for characteristics such as the marginal distribution of failure time or the joint distribution of failure time and marker value at failure. This paper presents a model based on a bivariate Wiener process in which one component represents the marker and the second, which is latent (unobservable), determines the failure time. In particular, failure occurs when the latent component crosses a threshold level. The model yields reasonably simple expressions for the characteristics mentioned above and is easy to fit to commonly occurring data that involve the marker value at the censoring time for surviving cases and the marker value and failure time for failing cases. Parametric and predictive inference are discussed, as well as model checking. An extension of the model permits the construction of a composite marker from several candidate markers that may be available. The methodology is demonstrated by a simulated example and a case application. 相似文献
29.
Using data from the 1981, 1991, and 2001 waves of the Panel Study of Income Dynamics and several decennial censuses, we examine
how characteristics of metropolitan areas are associated with black and white households’ neighborhood racial composition.
Results from hierarchical linear models show that about 20% to 40% of the variation in the percentage of households’ tract
population that is non-Hispanic white or non-Hispanic black exists across metropolitan areas. Over time, white households’
exposure to non-Hispanic white neighbors has declined, and their exposure to non-Hispanic black neighbors has increased; the
reverse trends are observed for blacks. These trends cannot be attributed to changes in the ecological structure of metropolitan
areas. Blacks have fewer white neighbors in large metropolitan areas containing sizable minority populations, and blacks have
more white neighbors in metropolitan areas with high government employment. Whites have more black neighbors in metropolitan
areas with high levels of government employment and ample new housing; whites have fewer black neighbors in metropolitan areas
with a high level of municipal fragmentation. The association between metropolitan-area percentage black and tract percentage
black is weaker among whites than among blacks, suggesting that whites are especially motivated to self-segregate in metropolitan
areas with large black populations. 相似文献
30.
When offering a product that has a complementary product in a different market, a firm must consider the interdependence between the complementary products as well as the competition within markets. If the firm participates in both markets, the balancing act becomes even more challenging. This article provides insights about strategies in this latter setting: when should the firm seek to keep its products closed to competing complementary products, and when would the firm be better off by accepting a common standard? To address these questions, we employ standard game theoretic analysis to a simple spatial model that captures aspects of both intermarket externalities and intramarket competition. We find that if a firm participates in both markets and chooses a closed standard, it achieves lower profits compared to an open standard, but gains greater market share. Surprisingly, we find that customers are better off when standards are kept closed. 相似文献