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What are secondary data? Secondary data refer to data that are collected by someone other than the user or are used for an additional purpose than the original one. A wide range of sources can be used as secondary data: censuses, information collected by government departments, organizational records and data that were originally collected for other research purposes [1-3]. Yee and Niemeier [4] discuss the benefits of longitudinal data as compared to repeated cross-sectional information.
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LL et al. (2020) studied this question.
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