#sampling  (statistics) the selection of a suitable sample for study
  supertype:  #choice.action__selection__option__pick  the act of choosing or selecting; "your choice of colors was unfortunate"; "you can take your pick"
  subtype:  #random_sampling  the selection of a random sample; each element of the population has an equal chance of been selected
  subtype:  #stratified_sampling__representative_sampling__proportional_sampling  the population is divided into subpopulations (strata) and random samples are taken of each stratum

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