American Psychological Association Linked Data Sets
HSRIC - NIH Health Services Research Information Center: data, tools, and statistics
Journal of Open Psychology Data
Open Access Directory: Data Repositories - see Social Sciences listings
PLOS ONE Recommended Repositories - see Social Sciences listings
Open Data Handbook - guide, case studies, and resource library
Qualitative Data Repository (Syracuse University) - access to digital data used in qualitative and multi-method social inquiry.
ICPSR (U. Mich) - Consortium for Political and Social Research
Systems and Psychosocial Advances Research Center (UMass Medical School)
Roper Center Public Opinion Archives (Cornell U)
SPARC Open Data - policies, handbooks, and guides from the Scholarly Publishing and Academic Resources Coalition
Open Access Spectrum Guide (PLOS ONE)
Major polling organizations and research centers publish tallies of their results which may be useful in developing your thesis or as a statistical reference. Government and NGOs also publish population statistics, both online and in print.
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