השוואת שיטות

	דגימת אשכולות פרופורציונלית – הסתברות פרופורציונלית לגודל	דגימה אקראית פשוטה
תחום	מתודולוגיית סקרים	מתודולוגיית סקרים
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1950s–1960s	Early 20th century; systematized by Cochran 1953/1977
הוגה השיטה	Formalized by William G. Cochran and Leslie Kish	William Gosset, Jerzy Neyman, and formalized by William Cochran
סוג	Probability sampling design	Probability sampling design
מקור מכונן	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
כינויים	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
קשורות	6	6
תקציר	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.