A survey is conducted to examine a population on the basis of a sample. The resulting
DataSets can be used to make statements about the population.
The sampling method is the procedure for selecting sample members from a population. It must match the controlled vocabulary specified by VFDB.
See also: ` Catalog: GNERD: Sampling Procedure Educational Research (Version 1.0) <https://mdr.iqb.hu-berlin.de/#/catalog/1d791cc7-6d8d-dd35-b1ef-0eec9c31bbb5“>`_