So sánh phương pháp

	Chọn mẫu phân tầng dựa trên thực địa	Lấy mẫu có hệ thống
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1934 (Neyman's stratified sampling theory); field applications throughout 20th century	Mid-20th century (Cochran 1953; Kish 1965)
Người khởi xướng	Jerzy Neyman (stratified sampling theory); applied broadly in field survey practice	William G. Cochran; formalized in survey sampling theory
Loại	Probability sampling design	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	field stratified sampling, stratified field survey sampling, in-field stratified sampling, field survey stratification	interval sampling, systematic random sampling, equal-interval sampling, fixed-interval sampling
Liên quan	6	5
Tóm tắt	Field-based stratified sampling divides a geographically dispersed or heterogeneous target population into internally homogeneous subgroups (strata) defined by features observable in the field — such as land use type, habitat zone, administrative district, or community category — and then independently draws random samples from each stratum during on-site data collection. The approach combines the precision gains of stratification with the logistical realities of fieldwork, ensuring that every identifiable subgroup of the landscape or community is represented in the final data set.	Systematic sampling is a probability sampling technique in which every k-th element is selected from an ordered list of the population after a random starting point. With population size N and desired sample size n, the sampling interval k = N/n is computed and one unit is chosen at random from the first interval; all subsequent units are selected by adding k repeatedly. The method is operationally simple, yields a spread-out sample, and often achieves lower variance than simple random sampling when the list has no harmful periodicity.