Secondary data means information that has already been processed and collected by somebody else.
Disadvantages are, for example:
-The information can be biased
-The information may not perfectly suit you research objective (information may be qualitative)
These two main points are decisive and non-debatable enough.
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Assuming that you are referring to secondary data analysis or the analysis of existing data sets, the primary disadvantage is that you have no control over what has been collected, and most likely no direct contact with respondents to clarify data issues.
Advantages to the secondary data collection method are - 1) it saves time that would otherwise be spent collecting data, 2) provides a larger database (usually) than what would be possible to collect on ones own However there are disadvantages to the fact that the researcher cannot personally check the data so it's reliability may be questioned. See: http://en.wikipedia.org/wiki/Secondary_data The link above is primarily on the use of secondary data for purposes of calculating statistics. In this electronic age, secondary data is disseminated very rapidly, such as credit card or employment history. You may want to browse the internet about problems when personal secondary data is widely available.
primary data is where you get o fact off a computer or from a book secondary data is where you get a fact of someone and it might not be true
Primary data is data that is collected by the researcher. Secondary data is information that has been collected by someone other than the user.
Primary data is the the data that collected by yourself. While secondary data is those collected by others and to be reused by yourself.
Secondary - unless it is something was published based on data that you yourself collected..