방법 비교

	현장 기반 눈덩이 표본 추출	스노우볼 표본 추출
분야	조사방법론	조사방법론
계열	Process / pipeline	Process / pipeline
기원 연도	1961 (foundational); field variant developed through 1970s–1980s ethnographic and hidden population research	1961
창시자	Leo A. Goodman (snowball sampling); field adaptation through ethnographic and social network research traditions	Leo A. Goodman
유형	Non-probability sampling technique	Non-probability sampling technique
원전	Goodman, L. A. (1961). Snowball sampling. Annals of Mathematical Statistics, 32(1), 148–170.	Goodman, L. A. (1961). Snowball sampling. Annals of Mathematical Statistics, 32(1), 148–170.
별칭	in-person snowball sampling, fieldwork chain-referral sampling, field snowball sampling, face-to-face referral sampling	chain-referral sampling, network sampling, respondent-driven sampling, referral sampling
관련	3	3
요약	Field-based snowball sampling is a non-probability chain-referral technique in which an initial set of in-person contacts (seeds) recruit further participants from within their real-world social networks, expanding the sample iteratively through face-to-face interaction in naturalistic field settings. It is the default snowball approach in ethnographic and community fieldwork, and is particularly valuable when the target population is hidden, hard-to-reach, or lacks a sampling frame.	Snowball sampling is a non-probability recruitment technique in which initial participants (seeds) refer the researcher to others who meet the study criteria, and those referrals in turn refer further participants. The sample grows incrementally — like a rolling snowball — until the required size or theoretical saturation is reached. It is the method of choice when a target population has no accessible sampling frame, such as undocumented migrants, illicit drug users, survivors of stigmatised experiences, or members of closed professional networks.