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The following are expectations for how values in these variables will group records given their hierarchy. Jira

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Metadataspec
VariablesRecord GroupingPurpose of Grouping

STUDYID

By study

All records with the same STUDYID value are a group of records that describe that study.

DOMAIN

By domain

All records with the same DOMAIN value are a group of records that describe that domain.

--CAT, --SCAT

Across subjects

--CAT and --SCAT values subset groups of records

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within a domain and apply to all subjects within the domain. 

USUBJID

By subject

All records with the same USUBJID value are a group of records that describe that subject.

--GRPID

For subjects

All records in the same domain with the same --GRPID value are a group of records within USUBJID. 

The optional grouping identifier variable --GRPID may be used in all domains based on the general observation classes. --GRPID identifies relationships between records within a USUBJID within a single domain and has no inherent meaning across subjects or across domains. Relationships between observations are defined by assigning the same unique character value to the --GRPID variable for sets of related observations. The values used for --GRPID can be any values the applicant chooses; however, if the applicant uses values with some embedded meaning (rather than arbitrary numbers), those values will be consistent.  JirashowSummaryfalseserverIssue Tracker (JIRA)serverId85506ce4-3cb3-3d91-85ee-f633aaaf4a45keyTOBA-623. --GRPID values are not intended to have any meaning across subjects and are usually assigned during or after data collection.

Using --GRPID in the general-observation class domains can reduce the number of records in the RELREC, SUPP--, and CO datasets, when those datasets represent relationships/associations for records or values to a "group" of general observation class records.

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