Random sample

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A random sample or “systemic sampling” is a sample obtained through a random drawing procedure. This is why it is also called a probability sample. When done properly, this type of sampling avoids sampling bias. With this in mind, 2 main rules must be respected:

  • The base population must include all subjects, objects or spatial units from which the subset selection will be made,
  • Selection should be based on an independent random sampling procedure. For example, you can use a table of random numbers to make the selection.