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