Salīdzināt metodes

	Lauka apstākļos balstīta novirzīto gadījumu atlase	Sniegpulksteņa (vai ķēdes) izlase
Nozare	Aptauju metodoloģija	Aptauju metodoloģija
Saime	Process / pipeline	Process / pipeline
Izcelsmes gads	1980s–1990s (purposive/deviant case sampling literature)	1961
Autors	Michael Quinn Patton; Yvonna Lincoln & Egon Guba	Leo A. Goodman
Tips	Purposive qualitative sampling strategy	Non-probability sampling technique
Pirmavots	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711	Goodman, L. A. (1961). Snowball sampling. Annals of Mathematical Statistics, 32(1), 148–170.
Citi nosaukumi	field deviant case sampling, outlier case sampling in field research, extreme case sampling in fieldwork, in-situ deviant case sampling	chain-referral sampling, network sampling, respondent-driven sampling, referral sampling
Saistītās	5	3
Kopsavilkums	Field-based deviant case sampling is a purposive strategy that deliberately selects cases deviating markedly from an established pattern or norm, with data collected through direct fieldwork — observation, in-situ interviews, and ethnographic engagement — in the participants' natural settings. By studying outliers on-site, researchers gain contextually grounded insight into why and how certain cases diverge from the typical pattern.	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.