পদ্ধতির তুলনা করুন

	ক্ষেত্র-ভিত্তিক বিচ্যুতিপূর্ণ কেস স্যাম্পলিং	উদ্দেশ্যমূলক নমুনায়ন
ক্ষেত্র	জরিপ পদ্ধতি	জরিপ পদ্ধতি
পরিবার	Process / pipeline	Process / pipeline
উদ্ভবের বছর	1980s–1990s (purposive/deviant case sampling literature)	Formalized ~1980–1990
প্রবর্তক	Michael Quinn Patton; Yvonna Lincoln & Egon Guba	Michael Quinn Patton (systematic articulation); roots in early qualitative inquiry
ধরন	Purposive qualitative sampling strategy	Non-probability sampling strategy
মৌলিক উৎস	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711	Patton, M. Q. (1990). Qualitative Evaluation and Research Methods (2nd ed.). Sage. ISBN: 978-0803937796
অপর নাম	field deviant case sampling, outlier case sampling in field research, extreme case sampling in fieldwork, in-situ deviant case sampling	judgmental sampling, selective sampling, criterion-based sampling, purposeful sampling
সম্পর্কিত	5	4
সারসংক্ষেপ	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.	Purposive sampling is a non-probability strategy in which the researcher deliberately selects participants, documents, or cases that are information-rich with respect to the research question. Rather than drawing units at random, the researcher applies explicit criteria aligned with the study's purpose, maximising the depth and relevance of the data collected. It is the default sampling logic in most qualitative research designs and is also used in mixed-methods and applied evaluative work.