Secondary data is collected by someone other than the researcher, such as census information. Primary data is collected first hand, such as interviews.
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primary data structures
Secondary data plays a crucial role within assessments in emergencies, specifically in phase I and II when collecting data and information produced from outside the field assessment is necessary to provide a baseline with which to compare primary data. SD complements and benefits the primary data collection
An inherent problem in using secondary sources of data is that the data may have been skewed or manipulated a bit. Primary sources of data are always more reliable than secondary sources.
External secondary data - data that is obtained outside the firm itself.
primary data structures