ICPSR

icpsr.umich.edu

University of Michigan का सोशल साइंस स्टडीज़ का आर्काइव, विस्तृत कोडबुक के साथ। कोडबुक और मेथडोलॉजी PDFs इम्पोर्ट करें; डेटासेट के लिए फ्री अकाउंट चाहिए।

ICPSR has been the central archive for social science survey and study data since the 1960s, and its codebooks tend to spell out sampling design and variable construction in more detail than a published paper's methods section. That makes the codebook PDFs useful for a notebook even before touching the raw data, since they document exactly how a study was run. The datasets require a free account and sometimes a data use agreement, so plan for that step separately from importing documentation.