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1.
Random effects regression mixture models are a way to classify longitudinal data (or trajectories) having possibly varying lengths. The mixture structure of the traditional random effects regression mixture model arises through the distribution of the random regression coefficients, which is assumed to be a mixture of multivariate normals. An extension of this standard model is presented that accounts for various levels of heterogeneity among the trajectories, depending on their assumed error structure. A standard likelihood ratio test is presented for testing this error structure assumption. Full details of an expectation-conditional maximization algorithm for maximum likelihood estimation are also presented. This model is used to analyze data from an infant habituation experiment, where it is desirable to assess whether infants comprise different populations in terms of their habituation time. 相似文献
2.
Margaret Hunter 《Sociology Compass》2007,1(1):237-254
Colorism is a persistent problem for people of color in the USA. Colorism, or skin color stratification, is a process that privileges light-skinned people of color over dark in areas such as income, education, housing, and the marriage market. This essay describes the experiences of African Americans, Latinos, and Asian Americans with regard to skin color. Research demonstrates that light-skinned people have clear advantages in these areas, even when controlling for other background variables. However, dark-skinned people of color are typically regarded as more ethnically authentic or legitimate than light-skinned people. Colorism is directly related to the larger system of racism in the USA and around the world. The color complex is also exported around the globe, in part through US media images, and helps to sustain the multibillion-dollar skin bleaching and cosmetic surgery industries. 相似文献
3.
Information presented concurrently and redundantly to 2 or more senses (intersensory redundancy) has been shown to recruit attention and promote perceptual learning of amodal stimulus properties in animal embryos and human infants. This study examined whether the facilitative effect of intersensory redundancy also extends to the domain of memory. We assessed bobwhite quail chicks' ability to remember and prefer an individual maternal call presented either unimodally or redundantly and synchronously with patterned light during the period prior to hatching. Embryos provided with unimodal auditory exposure failed to prefer the familiar call over a novel maternal call postnatally at 48 hr and 72 hr following exposure. In contrast, embryos provided with redundant, synchronous audiovisual stimulation significantly preferred the familiar call at 48 hr following exposure, but not at 72 hr. A second experiment provided chicks with a single 10‐min refamiliarization with the familiar call at either 48 hr or 72 hr following hatching. Chicks given only unimodal auditory exposure prior to hatching did not appear to benefit from this brief postnatal refamiliarization, showing no preference for the familiar call at either 72 or 96 hr. Chicks that received redundant audiovisual stimulation prenatally showed a significant preference for the familiar call (following the brief reexpo sure 24 hr earlier) at both 72 and 96 hr of age. These results are the first to demonstrate that redundantly specified information is remembered longer and reactivated more easily than the same information presented unimodally. These findings provide further evidence of the salience of intersensory redundancy in guiding selective attention and perceptual learning during early development. 相似文献
4.
Hunter LM 《Population research and policy review》2006,25(2):157-174
In many developing regions, women and young girls spend several hours daily in the collection of natural resources. Still the link between these household resource strategies and stakeholder perceptions of development priorities remains unexplored. This project examines this association with survey data representative of the adult population from Ghana’s Coastal Region. Although natural resource scarcity and the sustainability of resource use represent key development challenges, there are others (e.g., energy, sanitation, employment, and educational opportunities). As such, even in the face of natural resource scarcity, individuals may place greater importance on other dimensions of development, especially if household resource strategies are perceived as relatively efficient. The analytical focus here is on water and the results suggest that gender roles shape household water collection strategies, while also shaping these strategies’ perceived opportunity costs. Specifically, Ghanian adults more often see drinking water provision as their primary development need when water sources are distant and/or when male household members collect water (particularly male heads). In the end, I argue that social science inquiry benefits by contextualizing social dynamics within environmental context, particularly within cultural settings in which human subsistence is intimately tied to the state of the natural environment. 相似文献
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Hilary Parsons Dick 《Qualitative sociology》2006,29(1):87-102
When a researcher enters an interview, she has already construed it as being a standard type of communicative event. This
article considers how a researcher's construal of a communicative event as either an ethnographic or survey interview shapes
the production of information. Interview standards entail epistemological assumptions that directly inform the type of information
sought and produced. I consider this process through a comparison of the elicitation techniques I employed in survey and ethnographic
interviews conducted during research in Mexico. I draw on theory in linguistic anthropology on the nature of meaning in language,
examining how dialogicality and interaction are essential to understanding the construal of communicative events. 相似文献
8.
Hilary Silver 《Sociological Forum》1993,8(2):181-204
This study assesses two competing theories about the extent to which homework—paid work in the home—helps integrate work and domestic roles for men and women. Contrasting male and female homeworkers with their counterparts working outside the home, it supports some aspects of both the resource and role overload theories, but predominantly the role overload perspective. Homeworkers, especially in the working class, experience less interference between job and family life, but perform more housework and child care. They have no more leisure time nor greater marital satisfaction than those working outside the home, but receive more family assistance with their paid jobs, suggesting that they combine tasks from their first and second shifts. Working at home does not break down gender roles in domestic life. Despite time saved from commuting, male homeworkers perform no more housework than comparable men working outside the home. Thus, the gender division of unpaid household labor is not simply a matter of resources or spatial logistics.An earlier version was presented at the meetings of the Eastern Sociological Society, Providence, Rhode Island, April 1991. 相似文献
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J. Maria Bermúdez Bertranna Muruthi Lisa M. Zak‐Hunter Morgan A. Stinson Desiree M. Seponski Joshua L. Boe Narumi Taniguchi 《Journal of marital and family therapy》2019,45(2):309-322
When working with clients in another language, having culturally relevant and properly translated clinic materials is vital to effective clinical practice. Not having them presents a barrier for bilingual therapists and their clients. This paper reviews common translation methods and introduces a multi‐level, community‐based approach for translating clinic materials for non‐English speaking clients. Informed by decolonizing practices, this five‐tier method includes members from the target community as cultural brokers to verify the accuracy and nuances of language for their cultural group, as well as a constant comparative method to ensure methodological rigor in the process of inclusion. We present community member's feedback and recommendations, as well as discuss advantages and challenges of using this collaborative culturally responsive translation method. 相似文献