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41.
Guang Guo Jessica Halliday Hardie Craig Owen Jonathan K. Daw Yilan Fu Hedwig Lee Amy Lucas Emily McKendry-Smith Greg Duncan 《Sociological methodology》2009,39(1):1-29
We describe the DNA collection processes of an initial pilot and full study, which is designed to investigate joint peer and genetic effects on health behaviors and attitudes in a college campus setting. In the main study, 2664 (79.5%) students completed a Web survey and 2080 (78.7% of the survey completers after adjusting for the ineligible) provided a saliva DNA sample. The response rate for completing both the survey and the DNA portion of the study is 62.5%. Our DNA yields are of high quality. Overall, our experiences and results demonstrate that genetic data can be successfully collected as a part of traditional social science survey research projects. To aid others in doing so, we provide extensive details of our data collection experiences and offer recommendations to future researchers seeking to do or evaluate similar work. 相似文献
42.
The thimbleberry aphid,Masonaphis maxima (Mason) lives on patches of plants that support 3,4 or 5 generations depending on site and weather. The life cycle requires
sexual females and males to produce overwintering eggs. The eggs hatch in the spring to produce the first ’fundatrix’ generation;
subsequent generations are produced parthenogenically. Males and other morphs are produced by wingless virginoparae, but sexual
females are produced by ’gynoparae’, a winged morph that is specialized to produce only sexual females. The fundatrices have
no indication of the number of generations that the plants will support in the current year. There are two fundatrix types
that coexist in different ratios depending on the number of generations supported by the patch the previous year. One type
produces sexual females in generations 3 and 5, and males in generations 4 and 5; the other type produces sexual females in
generations 4 and 5, and males in generations 3, 4 and 5. The dimorphism adapts the aphid to its heterogeneous and somewhat
unpredictable environment. The role of sex in the maintenance of the dimorphism is discussed. This is the first report of
fundatrix polymorphism and consequent differential sex expression in aphids. 相似文献
43.
44.
Methodological Approaches to Assessing Risk Perceptions Associated with Food-Related Hazards 总被引:1,自引:0,他引:1
The psychometric approach developed by Slovic and his co-workers has been effectively used to assess risk perceptions associated with different food-related hazards. However, further examination (using questionnaire data and partial correlation techniques) has indicated that technological hazards are highly differentiated from lifestyle hazards, in terms of both hazard control and knowledge about the hazard. Optimistic bias was also seen to vary between hazards. Further research has focused on a particular hazard, genetic engineering. Risk perceptions associated with genetic engineering are underpinned by ethical concern and questions relating to perceived need for the technology, as well as perceptions of risk or harm. However, increasing the specificity of hazard stimuli was found to alter the factor structure of underlying risk perceptions. The utility of preference mapping procedures in determining individual differences in trust in risk regulators is also discussed. 相似文献
45.
Gary Neil Marks 《Social indicators research》2008,85(2):293-309
Since the early 1970s the importance of mothers’ socioeconomic characteristics on their children’s educational and occupational
attainment has been acknowledged. However, it is not clear if fathers’ characteristics have a stronger influence because men
usually have stronger attachments to the labour market, or alternatively mothers’ characteristics are more important because
of their greater role in children’s socialization. This study addresses this question by comparing the influence of father’s
and mother’s education and occupation on student performance in literacy and numeracy using data from 30 countries. The impact
of mother’s education is usually greater or comparable to that of father’s education. In contrast, substantially stronger
effects for mother’s occupational status compared to father’s were rare. In most countries the impact of mother’s socioeconomic
characteristics (education plus occupation) on student performance is comparable to that for father’s. Of the four indicators
of socioeconomic background, father’s occupational status and mother’s educational attainment tend to have stronger effects,
although many countries do not conform to this pattern. There are indications that the relative importance of mother’s characteristics
have increased over time.
相似文献
Gary Neil MarksEmail: |
46.
Neil Wrigley 《Revue europeenne de demographie》1990,6(4):327-358
This paper tackles the problem of handling uncontrolled heterogeneity due to unobserved influences on the decision process of spatial choice. It concentrates upon a discrete-time/‘random-effects’ approach to the problem of unobserved heterogeneity and documents parametric and non-parametric methods of specifying and estimating models which can cope with unobserved heterogeneity. 相似文献
47.
We consider approximate inference in hybrid Bayesian Networks (BNs) and present a new iterative algorithm that efficiently
combines dynamic discretization with robust propagation algorithms on junction trees. Our approach offers a significant extension
to Bayesian Network theory and practice by offering a flexible way of modeling continuous nodes in BNs conditioned on complex
configurations of evidence and intermixed with discrete nodes as both parents and children of continuous nodes. Our algorithm
is implemented in a commercial Bayesian Network software package, AgenaRisk, which allows model construction and testing to
be carried out easily. The results from the empirical trials clearly show how our software can deal effectively with different
type of hybrid models containing elements of expert judgment as well as statistical inference. In particular, we show how
the rapid convergence of the algorithm towards zones of high probability density, make robust inference analysis possible
even in situations where, due to the lack of information in both prior and data, robust sampling becomes unfeasible. 相似文献
48.
Through examining the case of people with epilepsy (which, as we demonstrate, has an ambiguous status in relation to both popular and academic conceptions of disability) we explore the fluid, negotiable and contingent nature of identity and, in particular, the identification as ‘disabled’. Disability, we argue, cannot be reduced to either biology or social oppression, or even primarily to biological or social factors: it is the outcome of a complex interaction between a multiplicity of factors – biological, environmental, social, psychological, cultural and political – which will interact and be experienced differently by different people, at different times and in different situations. Rather than conceiving of disability in ‘all or nothing’ terms and of differing explanations as competing and mutually exclusive, it would be more productive to see them as partial and potentially complementary contributions to the better understanding of a complex and multifarious reality. 相似文献
49.
Research on sex differences in occupational attainment suggests that working men and working women attain essentially the same mean level of occupational attainment and do so through quite similar processes. A possible explanation for these similarities is that the sample of working women contains an overrepresentation of successful women, since women who can afford not to work will stay out of the labor force unless they find a job commensurate with their education. This we define as a censoring problem. By extending a technique developed by Heckman, we can estimate the structural parameters for all women, regardless of current employment status. This procedure allows us to assess the impact of the censoring problem on women's occupational attainment equations. 相似文献
50.