publish the data in an academic journal
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The data collected does not have to be measurable.
primary data is data which has been collected by yourself, which is more reliable and up to date. secondary data has been collected from a secondary source (Other people, business etc.) so it may not be valid or up to date
In continuous grouped data the data is collected continuously and in groups. Data collected is in class intervals the actual data values are not visible.
how is data collected and used for the purpose of national statistics
Primary data is the the data that collected by yourself. While secondary data is those collected by others and to be reused by yourself.