手法を比較

	確率比例抽出（Proportional Cluster Sampling	単純無作為抽出法
分野	調査方法論	調査方法論
系統	Process / pipeline	Process / pipeline
提唱年	1950s–1960s	Early 20th century; systematized by Cochran 1953/1977
提唱者	Formalized by William G. Cochran and Leslie Kish	William Gosset, Jerzy Neyman, and formalized by William Cochran
種類	Probability sampling design	Probability sampling design
原典	Cochran, W. G. (1977). Sampling Techniques (3rd ed.). John Wiley & Sons. ISBN: 978-0471162407	Cochran, W. G. (1977). Sampling Techniques (3rd ed.). John Wiley & Sons. ISBN: 978-0471162407
別名	PPS cluster sampling, proportional-to-size cluster sampling, size-proportional cluster sampling, probability proportional to size sampling	SRS, unrestricted random sampling, equal-probability sampling, EPSEM
関連	6	6
概要	Proportional cluster sampling selects naturally occurring groups (clusters) from a population with probability proportional to each cluster's size, so that larger clusters have a higher chance of selection while every individual element retains an equal overall inclusion probability. This design efficiently handles large, geographically dispersed populations and is the backbone of national health, education, and social surveys worldwide.	Simple random sampling (SRS) is the foundational probability sampling method in which every unit in the population has an equal and independent chance of being selected. Because selection is governed purely by chance, SRS eliminates systematic bias, supports unbiased estimation of population parameters, and provides the statistical baseline against which all more complex probability designs are evaluated.