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91.
Mediation and moderation are two theories for refining and understanding a causal relationship. Empirical investigation of
mediators and moderators requires an integrated research design rather than the data analyses driven approach often seen in
the literature. This paper described the conceptual foundation, research design, data analysis, as well as inferences involved
in a mediation and/or moderation investigation in both experimental and non-experimental (i.e., correlational) contexts. The
essential distinctions between the investigation of mediators and moderators were summarized and juxtaposed in an example
of a causal relationship between test difficulty and test anxiety. In addition, the more elaborate models, moderated mediation
and mediated moderation, the use of structural equation models, and the problems with model misspecification were discussed
conceptually.
相似文献
Bruno D. ZumboEmail: |
92.
Multidimensional poverty: An alternative measurement approach for the United States? 总被引:1,自引:0,他引:1
Udaya R. Wagl 《Social science research》2008,37(2):559-580
International poverty research has increasingly underscored the need to use multidimensional approaches to measure poverty. Largely embraced in Europe and elsewhere, this has not had much impact on the way poverty is measured in the United States. In this paper, I use a comprehensive multidimensional framework including economic well-being, capability, and social inclusion to examine poverty in the US. Data from the 2004 General Social Survey support the interconnectedness among these poverty dimensions, indicating that the multidimensional framework utilizing a comprehensive set of information provides a compelling value added to poverty measurement. The suggested demographic characteristics of the various categories of the poor are somewhat similar between this approach and other traditional approaches. But the more comprehensive and accurate measurement outcomes from this approach help policymakers target resources at the specific groups. 相似文献
93.
94.
Counterfeiting is now widely regarded as a serious social, economic, and political issue. This study examined demographic, personality, and individual difference predictors of willingness to buy counterfeit goods (WBCG) in a community sample of British adults. Two-hundred and thirty-seven participants completed a questionnaire that assessed their willingness to buy 19 types of counterfeit goods, attitudes towards counterfeiting, material values, Big Five personality traits, and demographics. Structural equation modelling showed that attitudes towards counterfeiting were the strongest predictors of WBCG. In addition, material values predicted both WBCG directly and indirectly through attitudes towards counterfeiting. Older participants showed lower WBCG, although this effect was moderated by participants’ conscientiousness, material values, and attitudes towards counterfeiting. There were no sex differences in WBCG once participants’ age and conscientiousness had been taken into account. These results are discussed in relation to the extant literature on the profiles of consumers who buy counterfeit products. 相似文献
95.
Scheike TH 《Lifetime data analysis》2006,12(4):461-480
I suggest an extension of the semiparametric transformation model that specifies a time-varying regression structure for the
transformation, and thus allows time-varying structure in the data. Special cases include a stratified version of the usual
semiparametric transformation model. The model can be thought of as specifying a first order Taylor expansion of a completely
flexible baseline. Large sample properties are derived and estimators of the asymptotic variances of the regression coefficients
are given. The method is illustrated by a worked example and a small simulation study. A goodness of fit procedure for testing
if the regression effects lead to a satisfactory fit is also suggested. 相似文献
96.
97.
陈昭栋 《电子科技大学学报(社会科学版)》2004,(5)
简述了平面热源法瞬态测量材料热物理性质的基本原理,分析了快速法、脉冲法测量存在的问题。在此基础上,研究了材料热物性瞬态自动测量技术。测量实践表明:瞬态自动测量仪测量准确可靠,与用防护热板法测量的结果也符合得很好。 相似文献
98.
板料成形过程中普遍存在着回弹问题,特别在弯曲和浅拉深过程中回弹现象更严重,在板料成形领域,回弹已成为模具设计中要考虑的关键问题。本文从成形过程模拟和回弹过程模拟两方面对影响回弹模拟精度的主要因素进行了研究,指出限制回弹模拟精度提高的重要因素和提高回弹模拟精度的主要措施。 相似文献
99.
当今网络团购已成为电子商务的新兴力量,大量团购网站涌现。以团购网站为研究对象,基于期望证实模型(ECM)构建了影响团购网站继续使用行为的因素研究模型(该模型包含感知有用、感知经济性、感知愉悦、信任、满意、证实、继续使用意愿等7个因素),并对用户使用团购网站后影响其继续使用行为的因素进行了实证分析和验证。结果显示:用户的预期感受与实际使用后的证实程度对感知经济性、感知有用、满意有显著影响;感知经济性、感知有用、满意等3个因素对用户的继续使用意愿有显著影响,而信任因素对使用意愿的影响不显著。 相似文献
100.
纪威 《内蒙古工业大学学报》1992,(2)
本文通过对有关文献提供的干空气和水蒸汽热力参数的准确值进行的拟合,在宽广的参数范围内给出了湿空气热力参数的计算方程。为制冷、空调、干燥和采暖通风等技术中湿空气的热力性质和热力过程的计算,提供了方便条件。 相似文献