Primary data is original data collected firsthand for a specific research purpose, while secondary data is existing data collected by others for different purposes. 首先确定问题完整且不包含需要舍弃的情况。初级数据(primary data)指
4、With a secondary data source, users cannot save the data they enter into the form to use offline.使用辅助数据源，用户无法保存他们在表单中输入的数据以便脱机使用。
primary data是主要数据，secondary data是次要数据。用Primary data举例子：separate the primary data and indices to that data.他们的解决方案是把主要数据和这些数据的索引分离开来。The Node object is the primary data type for the entire DOM.节点对象是整个DOM中最主要的数据类型。用Secondary da...
Primary and Secondary data-主要和次要数据 Primary and Secondary data-主要和次要数据 Primary dataare data collected especially/particularly for a specific purpose. Secondary dataare data which have already been collected elsewhere, for some other purpose, but which can be used or adapted for the surv...
Today’scoursestructures:Firstclass:taughtcourseDatasources:1.Secondarydata2.PrimarydataSecondclass:discussingwithyouaboutyourresearchtopicandresearchproblems(questions)2 Lecture5Datasources Purposeofthischapter:a.Thedefinitionofsecondaryandprimary datab.Whatwemeanbydatacollectionc.Whatthesourcesofdatacollectiond...
一级数据库(primary database):数据直接来源于实验获得原始数据,只经过简单的归类、整理和注释。例如GenBank、EMBL、DDBJ、SWISSPORT、PDB。 二级数据库(secondary database):在一级数据库、实验数据和理解分析的基础上针对特定的目标衍生而来,是对生物学知识和信息的进一步整理。例如human genome databases GDB转录因子数...
一手数据（Primary data）：也称原始数据。指通过人员访谈、询问、问卷、测定等方式直截获得的，时效性和相关性更好。二手数据（Secondary data）：利用文献，统计年报以及数据库等前人统计好的数据资料。优点是获取成本低，且现成可用。一般可以长时间保存，生成数据趋势图方便。一手数据提能够提供量身定制的...
Primary vs. secondary data Data: Data is information collected to be used for research or reference purposes. Usually, pieces of data are gathered to support some type of hypothesis. Depending on the nature of the research, data can take many forms and presented in a variety of ways, such ...
Primary data is gathered actively while secondary data is gathered by referencing existing research. Answer and Explanation: Secondary data is past data that already exists in some public form. Therefore, secondary data has the advantage of being easy...
和Secondary data不同,初级研究是对Primary data进行分析的方法。所谓Primary data,指的是和二手资料或次级资料不同的、研究者亲自采集的资料。在严肃的学术性研究中,初级研究因为数据的原始性、客观性和直接性备受研究者关注。从某种意义上说,初级数据才是科学研究最可靠的数据。因为初级数据是基于研究者本人的亲身经历...