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The reference specifications introduces introduce the Reference Dataset Structure. A Reference Dataset Structure dataset contains one record per combination of Stratum values. At least one stratum variable is required and up to 99 stratum variables can be present in a reference dataset. There may several reference datasets in a study. This section of the TIG defines the standard variables used in reference datasets.

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The source file may change over time so capturing the name of the source file either in the dataset or the deifne file allows for traceability back to the source. If the source name is captured in the dataset then REFSRCE (Reference Data Source) is the variable to use.

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REFERENCE REFERENDS Reference VariablesREFERENCE
REFERENDS Reference Variables

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