Postcard reminders versus replacement questionnaires and mail survey response rates from a professional population

Nonresponse is a major problem in the use of mail questionnaires. The great number of variables that can influence response rates has resulted in an extensive literature on the subject, but a literature that is restricted to few examples of replication. Moreover, many of the studies reported in the literature were not conducted under controlled conditions. This article presents the results of a study using a single-factor experimental design to test the efficacy of two different follow-up forms in improving response rates. The results indicate that replacement questionnaires are to be preferred over postcard reminders when using a one-time follow-up in surveying a professional population.     

基于G1-变异系数的私募股权融资风险评价

私募股权融资风险评价研究是一项复杂而系统的工作,其中既有定性的研究也有定量的分析。本文构建私募股权融资风险评价指标体系,采用G1法与变异系数法相结合的方式确定指标体系综合权重,以模糊数学原理为基础,构建私募股权融资风险综合评价模型,对P企业私募股权融资风险进行综合评价。评价结果表明,P企业私募股权融资风险的综合评价值为3.6297,处于极其接近良好的状态,风险较低,表明该项目适合进行私募股权融资。其中金融风险的分值为3.4965,环境风险的分值为3.2305,管理风险的分值为3.4181,政策风险的分值为3.6026,市场风险的分值为4.0832,财务风险的分值为3.8811,表明各个风险的评价分值都适合进行私募股权融资,融资风险较小。本研究可为现有私募股权融资风险评价与选择提供借鉴和参考。     

中国与“一带一路”沿线国家与地区机电产品贸易强度动态变化及其影响因素研究

“一带一路”倡议的提出和实施为中国与“一带一路”沿线国家与地区间机电贸易合作提供了新机遇。基于“一带一路”沿线60个国家与地区2010—2018年机电产品贸易数据,使用改进的双边显示性贸易偏好指数测度中国同“一带一路”沿线国家与地区机电产品贸易强度的动态变化,并采用扩展引力模型检验其主要影响因素。研究结果表明:中国同“一带一路”沿线国家与地区的机电产品贸易强度日益增加,且出口强度高于进口强度,周边邻国高于其他国家;技术差距、“一带一路”沿线国家与地区的市场需求、外贸开放度、政府规模、地缘优势等因素可以显著促进中国同“一带一路”沿线国家与地区双边机电产品贸易强度。     

TM1：5万卫片在内蒙古科右前旗耕地变更调查中的应用

介绍了ＴＭ１：１万卫片在内蒙古科右前旗耕地更调查中的应用,分析了耕地变更情况及变更趋势。     

TM1∶5万卫片在内蒙古科右前旗耕地变更调查中的应用

介绍了TM1∶5万卫片在内蒙古科右前旗耕地变更调查中的应用、分析了耕地变更情况及变更趋势。     

黑龙江省农业生产资料与农业经济发展的关联分析

黑龙江省是一个农业大省,农业经济对全省经济的发展起到至关重要的作用,而农业生产资料对农业经济的发展有着巨大的影响作用。应用灰色系统理论中关联分析方法和GM(1,1)预测模型,对黑龙江省农业总产值与农业生产资料之间的关系进行关联分析,在其发展趋势预测的基础上,对黑龙江省农业经济发展的趋势关联分析,进而提出黑龙江省实现农业经济持续发展、科学决策对策建议。     

Food consumption impacts of adherence to dietary norms in the United States: a quantitative assessment

Promotion of adherence to healthy-eating norms has become an important element of nutrition policy in the United States and other developed countries. We assess the potential consumption impacts of adherence to a set of recommended dietary norms in the United States using a mathematical programming approach. We find that adherence to recommended dietary norms would involve significant changes in diets, with large reductions in the consumption of fats and oils along with large increases in the consumption of fruits, vegetables, and cereals. Compliance with norms recommended by the World Health Organization for energy derived from sugar would involve sharp reductions in sugar intakes. We also analyze how dietary adjustments required vary across demographic groups. Most socio-demographic characteristics appear to have relatively little influence on the pattern of adjustment required to comply with norms. Income levels have little effect on required dietary adjustments. Education is the only characteristic to have a significant influence on the magnitude of adjustments required. The least educated rather than the poorest have to bear the highest burden of adjustment. Our analysis suggests that fiscal measures like nutrient-based taxes may not be as regressive as commonly believed. Dissemination of healthy-eating norms to the less educated will be a key challenge for nutrition policy.