A field survey approach was applied for this research, the first-hand information by investigation on Jingxing mining area of Shijiazhuang was used as the data sources.
采用实地调查的方法，以石家庄市井陉矿区调查的一手资料为数据来源进行研究。
But, secondary data, survey by an outside marketing research firm, mining of company's internal recording, and building customer's database in the trade process are widely used methods.
建立企业营销信息系统的方式可以是二手资料收集、委托外部市场研究公司收集、整理企业内部管理档案、在与顾客交易时建立顾客数据库等。
They were able to demonstrate this by mining the data sets of the Framingham Heart Study (FHS), a longitudinal survey that has revealed many of the risk factors underlying cardiovascular disease.
而弗雷明汉心脏研究（以下简称FHS）正是一项纵向调查，它可以显示出潜藏在心血管疾病之下的多种风险因子。
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