เปรียบเทียบวิธี

	การเลือกตัวอย่างกรณีเบี่ยงเบนตามบริบทภาคสนาม	การเลือกตัวอย่างกรณีที่เบี่ยงเบน
สาขาวิชา	ระเบียบวิธีสำรวจ	ระเบียบวิธีสำรวจ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1980s–1990s (purposive/deviant case sampling literature)	1990
ผู้ริเริ่ม	Michael Quinn Patton; Yvonna Lincoln & Egon Guba	Michael Quinn Patton
ประเภท	Purposive qualitative sampling strategy	Purposive qualitative sampling strategy
แหล่งต้นตำรับ	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711
ชื่อเรียกอื่น	field deviant case sampling, outlier case sampling in field research, extreme case sampling in fieldwork, in-situ deviant case sampling	extreme case sampling, outlier sampling, negative case sampling, deviant-case selection
ที่เกี่ยวข้อง	5	5
สรุป	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.	Deviant case sampling is a purposive qualitative sampling strategy in which the researcher intentionally selects cases that are unusual, exceptional, or markedly different from the norm — outliers, extreme successes, or conspicuous failures. The goal is not statistical representation but deep learning from cases that illuminate the boundaries of a phenomenon, challenge prevailing assumptions, or reveal processes that typical cases obscure.