เปรียบเทียบวิธี

	การชักตัวอย่างสองชั้น	การสุ่มตัวอย่างแบบเป็นระบบ
สาขาวิชา	การสุ่มตัวอย่าง	ระเบียบวิธีสำรวจ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1938	Mid-20th century (Cochran 1953; Kish 1965)
ผู้ริเริ่ม	Jerzy Neyman	William G. Cochran; formalized in survey sampling theory
ประเภท	Multi-phase sampling design	Probability sampling design
แหล่งต้นตำรับ	Neyman, J. (1938). Contribution to the theory of sampling human populations. Journal of the American Statistical Association, 33(201), 101–116.	Cochran, W. G. (1977). Sampling Techniques (3rd ed.). John Wiley & Sons. ISBN: 978-0471162407
ชื่อเรียกอื่น	Two-Phase Sampling	interval sampling, systematic random sampling, equal-interval sampling, fixed-interval sampling
ที่เกี่ยวข้อง	4	5
สรุป	Double Sampling (also called two-phase or multistage sampling) is a survey design in which a large preliminary sample is collected using inexpensive methods or partial information, then a smaller subsample is drawn from it and measured in detail. Pioneered by Jerzy Neyman in 1938, it is particularly useful when a cheap surrogate measurement is available but true measurement is expensive.	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.