So sánh phương pháp

	Lấy mẫu trường hợp lệch trực tuyến	Lấy mẫu thuận tiện trực tuyến
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	1990s–2000s (internet survey era)
Người khởi xướng	Patton, M. Q. (deviant case strategy); online adaptation via web-based qualitative research practice	Evolved from convenience sampling; internet applications documented from mid-1990s onward
Loại	Purposive qualitative sampling strategy (online variant)	Non-probability sampling
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	Gosling, S. D., Vazire, S., Srivastava, S., & John, O. P. (2004). Should we trust web-based studies? A comparative analysis of six preconceptions about internet questionnaires. American Psychologist, 59(2), 93–104.
Tên gọi khác	online extreme case sampling, internet-based deviant case sampling, online outlier sampling, web-based atypical case sampling	web-based convenience sampling, internet convenience sampling, digital convenience sampling, online accidental sampling
Liên quan	5	3
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.	Online convenience sampling is a non-probability technique in which participants are recruited via internet channels — survey platforms, social media, email lists, or research panels — simply because they are accessible and willing to respond. It is the online analogue of traditional convenience sampling, offering fast, low-cost data collection at the expense of known representativeness. It is among the most widely used approaches in social, behavioral, and health sciences research conducted through web-based surveys.