secondary data英文定义
问题描述：
secondary data英文定义
不是英文翻译，句子句子。
我知道是二手数据的意思，就是英文定义。句子形式的。
答
Secondary data is data collected by someone other than the user.Common sources of secondary data for social science include censuses,surveys,organizational records and data collected through qualitative methodologies or qualitative research.
Primary data,by contrast,are collected by the investigator conducting the research