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External secondary data - data that is obtained outside the firm itself.
Secondary data is data collected from other sources than your own such as reference books or the Internet.
primary data structures
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.
Secondary data is collected by someone other than the researcher, such as census information. Primary data is collected first hand, such as interviews.