French translation: échantillonnage en plusieurs étapes
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Sample obtained by procedures in which the items of interest are randomly distributed in parts of equal or unequal size. (ISO 11074-2)
NOTE 1 A sub-sample may be
a) a portion of the sample obtained by selection or division; or
b) an individual unit of the lot taken as part of the sample; or
c) the final unit of multistage sampling.