Gy's sampling theory
Gy's sampling theory is a theory about the sampling of materials, developed by Pierre Gy from the 1950s to beginning 2000s in articles and books including: (1960) Sampling nomogram (1979) Sampling of particulate materials; theory and practice (1982) Sampling of particulate materials; theory and practice; 2nd edition (1992) Sampling of Heterogeneous and Dynamic Material Systems: Theories of Heterogeneity, Sampling and Homogenizing (1998) Sampling for Analytical Purposes The abbreviation "TOS" is also used to denote Gy's sampling theory. Gy's sampling theory uses a model in which the sample taking is represented by independent Bernoulli trials for every particle in the parent population from which the sample is drawn.