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Grouping variables are Identifier and Grouping Qualifier variables used to group records in datasets . by study, topic,  When used as intended, values in grouping variables will align with the hierarchy shown below. 

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How to use Grouping Variables to Group Data

Metadataspec
VariableGroupingNotes
STUDYID

DOMAIN

--CAT

--SCAT

USUBJID

--GRPID





How Grouping Variables Group Data

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