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| Metadataspec |
|---|
Hierarchy of Grouping Variables | STUDYID |
| DOMAIN |
| --CAT |
| --SCAT |
| USUBJID |
| --GRPID |
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How Grouping Variables Group Data
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| Metadataspec |
|---|
| Grouping of Records | Variable(s) | Purpose of Grouping |
|---|
| By Study | STUDYID | - All records with the same
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- STUDYID value are a group of records that describe that
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| | By Domain | DOMAIN | - All records with the same
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- DOMAIN value are a group of records that describe that
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| | Across Subjects | --CAT and --SCAT | - --CAT and --SCAT values subset groups of tests within a domain and apply to all subjects within the domain. Generally, --CAT/--SCAT values have meaning within a particular domain and apply to all subjects within that domain. For example, a lab record with LBTEST = "SODIUM" might have LBCAT = "CHEMISTRY" and LBSCAT = "ELECTROLYTES".
| | By Subject | USUBJID | - All records with the same
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- USUBJID value are a group of records that describe that subject.
| | For Subjects | --GRPID |
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How Grouping Variables Group Data
- For the subject
- Across subjects (records with different USUBJID values) domain.
- --CAT and --SCAT values further subset groups of tests within a domain and are not redundant with the domain or dictionary classification provided by --DECOD and --BODSYS. Generally, --CAT/--SCAT values have meaning within a particular domain and apply to all subjects within that domain. For example, a lab record with LBTEST = "SODIUM" might have LBCAT = "CHEMISTRY" and LBSCAT = "ELECTROLYTES".
- --GRPID values further group (subset) records within USUBJID. Unlike --CAT and --SCAT, --GRPID values are not intended to have any meaning across subjects and they are usually assigned during or after data collection.
- Although --SPID and --REFID are identifier variables, these are usually not considered to be grouping variables, although they may have meaning across domains.
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