Statistical data can be obtained from two sources. Primary data is collected by the enumerator or by an organization or by a researcher by conducting an enquiry or an investigation. These data are based on first hand information and are research or project specific. Primary data is original data that has not been collected and published before.The data can be collected by direct observation,personal interviews, telephonic interviews or by questionnaire. Primary data collection may require lot of field investigation or observation.Primary data is more reliable and accurate however it requires more time and can be a costly affair.
When the Primary data is processed and published it becomes a secondary data. So Secondary data is basically the reuse of the data which has been collected in the past.
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