手法を比較

	比例的意図的サンプリング（Proportional Purposive Sampling）	比例層化抽出
分野	調査方法論	調査方法論
系統	Process / pipeline	Process / pipeline
提唱年	1980s–2000s	1953–1965 (formalized in survey sampling literature)
提唱者	Derived from purposive sampling tradition (Patton); formalized in mixed-methods literature	William G. Cochran; Leslie Kish
種類	Non-probability sampling with proportional allocation	Probability sampling design
原典	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711	Cochran, W. G. (1977). Sampling Techniques (3rd ed.). John Wiley & Sons. ISBN: 978-0471162407
別名	proportional criterion sampling, quota-proportional purposive sampling, representational purposive sampling	proportionate stratified sampling, proportional allocation stratified sampling, PSRS, proportionate stratified random sampling
関連	4	6
概要	Proportional purposive sampling combines the intentional case selection of purposive sampling with proportional allocation across subgroups. Researchers first determine how each meaningful subgroup (e.g., gender, school type, professional role) is represented in the population, then deliberately select participants from each subgroup in those same proportions — using purposive judgment to ensure each selected case is information-rich and relevant to the research question.	Proportional stratified sampling divides the target population into non-overlapping strata (subgroups defined by a key characteristic such as age band, region, or gender) and then draws a simple random sample from each stratum so that each stratum's share of the total sample matches its share of the total population. Because each subgroup is represented in exact proportion to its population weight, the resulting sample mirrors the population structure closely without requiring post-hoc weighting adjustments.