Primary data is data collected at source, in other words you are designing the way the data is collected, you decide whom to ask and when to ask and in most cases you will be collecting the data or doing the interviews.
Secondary data is using data collected by another person or organisation. Many people, public bodies and private organisations collect data and publish it for others to use. These sources of data as they are not collected are referred to as secondary sources.
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Office for National Statistics -
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OECD Statistics - Other statistical sources - Information on economic, geographical and political data.
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