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131.
Consider the model where there are I independent multivariate normal treatment populations with p×1 mean vectors μi, i=1,…,I, and covariance matrix Σ. Independently the (I+1)st population corresponds to a control and it too is multivariate normal with mean vector μI+1 and covariance matrix Σ. Now consider the following two multiple testing problems. 相似文献
132.
Alice J. Davidson Marsha D. Walton Bhavna Kansal Robert Cohen 《Social Development》2017,26(4):891-906
The importance of peer adjustment in middle childhood coincides with developing social cognitive and discursive skills that include the ability to make personal narrative accounts. Authoring personal stories promotes attention to the sequence of events, the causal connections between events, the moral significance of what has happened, and the motives that drive human action: these skills may be critical for the establishment and maintenance of satisfying peer relationships during elementary school. This study extended previous research by considering whether narrative skills in written stories about peer interactions predicted peer adjustment. As part of an ongoing longitudinal study, 92 children wrote narratives about peer experiences and completed surveys on measures of peer adjustment for two school years. Cross‐lagged panel models indicated that chronological and thematic coherence and reports of moral concerns in narratives in the first year of the study contributed to lower peer disliking in the subsequent academic year. Reports of motives in Year 1 narratives contributed to lower levels of loneliness and peer victimization in Year 2. Writing personal narratives that are coherent and attentive to moral concerns and motives may be especially beneficial for children who have difficulty connecting with peers. We discuss implications for classroom practices. 相似文献
133.
Children are increasingly using computer technologies to engage in acts of aggression against peers, often termed ‘cyber aggression’. Media reports have sensationalized instances of cyber aggression, and social scientists have begun to examine its characteristics and consequences. Using a younger sample of children than most previous research (192 third‐ through sixth‐grade children), the present research evaluated grade and gender effects on cyber aggression and, most importantly, evaluated the classroom peer social consequences of engaging in cyber aggression, after controlling for traditional, face‐to‐face aggression. Children reported engaging in cyber aggression at comparable rates across grades and between males and females. Engaging in cyber aggression was related to higher rates of loneliness and lower rates of global self‐worth, peer optimism, number of mutual friendships, social acceptability, and popularity. In short, after controlling for effects attributable to traditional aggression, cyber aggression was related to significant negative peer relations outcomes. 相似文献
134.
Joel E. Cohen 《The American statistician》2019,73(1):56-60
The mean and variance of a sum of a random number of random variables are well known when the number of summands is independent of each summand and when the summands are independent and identically distributed (iid), or when all summands are identical. In scientific and financial applications, the preceding conditions are often too restrictive. Here, we calculate the mean and variance of a sum of a random number of random summands when the mean and variance of each summand depend on the number of summands and when every pair of summands has the same correlation. This article shows that the variance increases with the correlation between summands and equals the variance in the iid or identical cases when the correlation is zero or one. 相似文献
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Conclusion We have argued that the influence of high levels of density on human health and behavior may be determined more by the individual's beliefs about hislher relationship to the environment than by the environment itself.An important implication of this analysis is that the behavior and health of those experiencing high density conditions can be altered (improved?) not only by changing their environment, but also by changing their attitudes toward their environment. Thus both interventions that actually provide people with the opportunity to terminate, periodically escape, or modify unwanted stimulation and those that otherwise provide them with the belief that such changes are within their power should similarly ameliorate the negative impact of high density.Preparation of this paper was supported by grants from the National Science Foundation (SOC 75-09224 and BNS 77-08576). 相似文献
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138.
This paper examines gendered housework in the larger context of comparative social change, asking specifically whether cross‐national differences in domestic labor patterns converge over time. Our analysis of data from 13 countries (N = 11,065) from the 1994 and 2002 International Social Survey Program (ISSP) confirmed that social context matters in shaping couples' division of labor at home, but also showed that context affects patterns of change. Our results suggested that, compared to the most egalitarian countries, the shift in housework patterns was greatest among the most traditional countries. This provides support for the thesis of cultural convergence, but the evidence did not suggest that such convergence will lead to complete equality in the foreseeable future. 相似文献
139.
Theory and Decision - 相似文献
140.