So sánh phương pháp

	Chọn mẫu phân tầng có trọng số	Lấy mẫu ngẫu nhiên đơn giản
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1953–1965	Early 20th century; systematized by Cochran 1953/1977
Người khởi xướng	Leslie Kish; William G. Cochran	William Gosset, Jerzy Neyman, and formalized by William Cochran
Loại	Probability sampling with weighting	Probability sampling design
Công trình gốc	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
Tên gọi khác	stratified sampling with weights, design-weighted stratified sampling, post-stratification weighting, WSS	SRS, unrestricted random sampling, equal-probability sampling, EPSEM
Liên quan	6	6
Tóm tắt	Weighted stratified sampling divides a population into non-overlapping strata and draws a probability sample from each stratum, then attaches a design weight to every selected unit so that estimates correctly represent the full population. Weights compensate for unequal selection probabilities that arise from disproportionate stratum allocations, non-response, or frame imperfections, making the procedure the backbone of most large-scale national and international surveys.	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.