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41.
Summary.  Social surveys are usually affected by item and unit non-response. Since it is unlikely that a sample of respondents is a random sample, social scientists should take the missing data problem into account in their empirical analyses. Typically, survey methodologists try to simplify the work of data users by 'completing' the data, filling the missing variables through imputation. The aim of the paper is to give data users some guidelines on how to assess the effects of imputation on their microlevel analyses. We focus attention on the potential bias that is caused by imputation in the analysis of income variables, using the European Community Household Panel as an illustration.  相似文献   
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The focus of this study was on the social networks of preschool children and on the interface between network characteristics and the child's acceptance by peers and teachers. Fifty-six children and their mothers were interviewed about the child's social support network. Social acceptance measures included peer sociometric ratings and teacher ratings of child preference and relationship quality. Frequency of contact with mother-nominated child network members was a determining factors in the concordance of mother and child reports. From the child's perspective, social acceptance was related to the presence and supportiveness of siblings and extended kin. Mother reports were less predictive, with only one significant association between parental support and teacher preference. In general, the children's perceptions regarding the structure and function of their social networks were found to be reliable and to relate meaningfully to social acceptance in the preschool domain.  相似文献   
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The tourist trend can be considered under several aspects. A widely accepted typology of the forms of tourism is the one formulated by E. Cohen, which in Italy was introduced by Asterio Savelli, proposing among the various tourism typologies a typological sequence which follows several objectives and routes depending on the different cultural realities, i.e. ethnical tourism, cultural tourism, historical (and artistic) tourism, environmental tourism and recreational tourism. Two forms seem to be dominant as ideal type, combining the characteristics of the social actor with the ones of the holiday resorts, the form of the vacationer, in the bathing, lake, hill or mountain resorts and the form of the sightseer, whose presence can be indicated as primary in the large centers of art and history and as secondary in the minor centers.  相似文献   
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OBJECTIVES: The purpose of this article is to highlight the benefits of collaboration in child focused mental health services research. METHOD: Three unique research projects are described. These projects address the mental health needs of vulnerable, urban, minority children and their families. In each one, service delivery was codesigned, interventions were co-delivered and a team of stakeholders collaboratively tested the impact of each one. RESULTS: The results indicate that the three interventions designed, delivered, and tested are associated with reductions in youth mental health symptoms. CONCLUSION: These interventions are feasible alternatives to traditional individualized outpatient treatment.  相似文献   
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