So sánh phương pháp

	Lấy mẫu thuận tiện theo tỷ lệ	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	Mid-20th century onward	Early 20th century; systematized by Cochran 1953/1977
Người khởi xướng	Developed within mainstream sampling methodology; no single originator	William Gosset, Jerzy Neyman, and formalized by William Cochran
Loại	Non-probability sampling with proportional allocation constraint	Probability sampling design
Công trình gốc	Etikan, I., & Bala, K. (2017). Sampling and sampling methods. Biometrics & Biostatistics International Journal, 5(6), 215–217.	Cochran, W. G. (1977). Sampling Techniques (3rd ed.). John Wiley & Sons. ISBN: 978-0471162407
Tên gọi khác	quota-constrained convenience sampling, representative convenience sampling, proportionate accidental sampling, PCS	SRS, unrestricted random sampling, equal-probability sampling, EPSEM
Liên quan	4	6
Tóm tắt	Proportional convenience sampling is a non-probability technique that recruits participants through convenience while constraining each subgroup's share in the final sample to match its known proportion in the target population. It trades pure random selection for feasibility, but partially compensates by ensuring the sample's compositional profile mirrors the population on one or more key variables such as gender, age group, or academic year.	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.