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Non-human data sources
Artefacts
Internet
Audio-viusuals
Visuals
Archives
Existing statistics
Human data sources
Non-Probability Sampling
Snowball Sampling
Convenience Sampling
Quota Sampling
Theoretical Samples
Purposive Samples
Probability Sampling
Stratified Random Sample
Systematic Random Sample
Random Sampling
Artifacts
Documents
Reliable
Accurate
Measurable
Precise Meaning for each variable
Relationship between variables
Independent
Dependent
Interactions
Households
People