What are the advantages of secondary data analysis?

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The biggest advantage of using secondary data is economics. Someone else has already collected the data, so we do not have to devote money, time, energy, and other resources to do it. Sometimes the secondary data set must be purchased, but the cost is almost always certainly lower than the expense of collecting a similar data set. There is also a huge saving in time. Since the data is already collected and usually cleaned and stored in electronic format, we can spend most of our time analyzing the data instead of getting the data ready for analysis.
Another major advantage of using secondary data is that the data collection process is often guided by expertise and professionalism that may not be available to us. Their expertise guarantees the high quality of the data.