Differnce between Primary and Secondary Data

Primary data	Secondary data
Primary data is collected through experiments, surveys, questionnaires, focus groups, interviews, and taking measurements.	Secondary data is collected through books, journalism census data, biographies articles and databases.
Primary data are always original as it is collected by the investigator.	Secondary data lacks originally the investigator makes use of the data collected by other agencies.
The suitability of the primary data will be positive because it has been systematically collected.	Secondary data may or may not suit the objects of inquiry
Primary data are expensive and time-consuming.	Secondary data are restively cheaper.
Extra precautions are not required	It is used with great care and caution
Primary data are in the shape of raw material	Secondary data are usually in the shape of ready-made products
Possibility of personal prejudice	Possibility of a lesser degree of personal prejudice
Investigating agency collects the data	Some other investigating agency collects it for their own use
Requires elaborate organization	No need for any organizational setup.