So sánh phương pháp

	Lấy mẫu trường hợp lệch trực tuyến	Lấy mẫu trường hợp điển hình
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1990s–2000s (deviant case strategy); online variant ~2000s–2010s	1980s (systematized in Patton 1990/2002)
Người khởi xướng	Patton, M. Q. (deviant case strategy); online adaptation via web-based qualitative research practice	Michael Quinn Patton
Loại	Purposive qualitative sampling strategy (online variant)	Purposive qualitative sampling strategy
Công trình gốc	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage. [Chapter 5: Purposeful Sampling, deviant/extreme case strategy, pp. 231-234] ISBN: 978-0761919711	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711
Tên gọi khác	online extreme case sampling, internet-based deviant case sampling, online outlier sampling, web-based atypical case sampling	typical case selection, modal case sampling, representative case sampling, average case sampling
Liên quan	5	5
Tóm tắt	Online deviant case sampling is a purposive qualitative sampling strategy in which the researcher deliberately seeks out and recruits participants who represent extreme, unusual, or outlier instances of the phenomenon under study, using online channels such as forums, social media, specialist communities, or digital registries. It inherits the logic of Patton's deviant (extreme) case sampling and applies it in internet-mediated research contexts where rare or hard-to-reach atypical cases can be located more efficiently than through face-to-face methods.	Typical case sampling is a purposive strategy in which the researcher deliberately selects cases that represent what is ordinary, normal, or most common within a target group. Rather than seeking outliers or the widest possible variation, the goal is to illustrate and communicate what a typical experience, program, or phenomenon looks like to stakeholders or audiences unfamiliar with it. The strategy is widely used in qualitative evaluation research and program reporting.