The type of sample and sample design used to select the survey respondents to represent the population. May include reference to the target sample size and the sampling fraction.To specify the use of a Controlled Vocabulary or standard concept use the internal element "concept". DDI provides a Controlled Vocabulary for this location: "SamplingProcedure". If multiple concepts are needed the parent element should be replicated. Internal text related to each concept should be allocated to accompany the relevant concept.
<sampProc>National multistage area probability sample</sampProc>
<sampProc>
<concept vocab="SamplingProcedure" vocabAgency="DDI" vocabURI="http://rdf-vocabulary.ddialliance.org/cv/SamplingProcedure/1.1.4/" vocabInstanceCodeTerm="Probability.SimpleRandom">Simple random sample</concept>
</sampProc>
<sampProc>Stratified random sample</sampProc>
<sampProc>Quota sample</sampProc>
<sampProc>The 8,450 women interviewed for the NSFG, Cycle IV, were drawn from households in which someone had been interviewed for the National Health Interview Survey (NHIS), between October 1985 and March 1987.</sampProc>
<sampProc>Samples sufficient to produce approximately 2,000 families with completed interviews were drawn in each state. Families containing one or more Medicaid or uninsured persons were oversampled. XHTML content may be used for formatting.</sampProc>