Secondary data may not answer fully answer the research questions of a study. It is also hard to establish its validity, and if proper sampling and data collection methods were employed.
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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
It takes really long to make and to record the data.
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.