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Table 2 Recruitment methods by categories

From: Hard-to-reach populations of men who have sex with men and sex workers: a systematic review on sampling methods

Recruitment methods Form Category
Convenience Venue-based Non-probabilistic
Purposive Link-tracing Non-probabilistic
Snowball Link-tracing Non-probabilistic
Targeted Link-tracing Non-probabilistic
Internet Venue-based Semi-probabilistic
RDS Link-tracing Semi-probabilistic
TLS Venue-based Semi-probabilistic
Cluster Probabilistic Probabilistic
Multi-stage probability sample Probabilistic Probabilistic
RDD Probabilistic Probabilistic
Stratified probability sampling Probabilistic Probabilistic