Secondary data 1-2

Secondary data

Already available data. Analysed by someone else. May be published data like Central state reports. International organisation reports. Journals books magazines newspapers research articles by universities scholars. statistics historical documents. Or it may be an published like diaries biography unpublished scholar work.
Readymade and readily available. Does not need time or cost for researcher to collect data.
Frequently used by researchers for specific information. Specially peer reviewed journals help. Can be used to test new information about study. Comparison
Limitations.

It depends on the tools and technology of the time when data was collected.
Buyers of researcher like colonial ethnographers.
Statistics change over time and societies also.
Data may not be authentic.
We do not know who got represented in the secondary data or if there was sampling bias.