Confronta i metodi

	Campionamento a Variazione Massima	Campionamento basato sui rispondenti (Respondent-Driven Sampling, RDS)
Campo	Metodologia delle indagini	Metodologia delle indagini
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1985 (Lincoln & Guba); elaborated 1990–2002 (Patton)	1997
Ideatore	Lincoln & Guba; systematised by Michael Quinn Patton	Douglas Heckathorn
Tipo	Purposive qualitative sampling strategy	Probabilistic chain-referral sampling design
Fonte seminale	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage. Chapter 5: Purposeful Sampling. ISBN: 978-0761919711	Heckathorn, D. D. (1997). Respondent-driven sampling: A new approach to the study of hidden populations. Social Problems, 44(2), 174–199.
Alias	maximum variation sampling, maximum diversity sampling, MVS, heterogeneous sampling	Chain-Referral Sampling, Peer-Referral Sampling, Network-Based Sampling, Katılımcı Güdümlü Örnekleme
Correlati	5	3
Sintesi	Maximum variation sampling is a purposive qualitative sampling strategy in which the researcher deliberately selects cases that span the widest possible range of variation on dimensions central to the study. The goal is not statistical representation but the identification of common patterns that cut across diverse cases as well as the documentation of the unique ways each context shapes the phenomenon under investigation.	Respondent-Driven Sampling (RDS) is a probabilistic chain-referral method designed to reach hidden or hard-to-reach populations that lack a sampling frame. Introduced by sociologist Douglas Heckathorn in 1997, RDS combines snowball recruitment with mathematical weighting based on participants' personal network sizes, allowing researchers to generate population-level estimates even when no complete membership list exists.