Enum: Frequency
Enumeration for frequency of occurrence
URI: [dfs:Frequency](https://w3id.org/OHD/DFA-study/dfs/Frequency)
## Permissible Values
| Value | Meaning | Description |
| --- | --- | --- |
| 1 | http://purl.obolibrary.org/obo/NCIT_C70543 | Never |
| 2 | http://purl.obolibrary.org/obo/NCIT_C73116 | Rarely |
| 3 | http://purl.obolibrary.org/obo/NCIT_C151974 | Occasionally |
| 4 | http://purl.obolibrary.org/obo/NCIT_C91245 | Very Often |
| 8 | http://purl.obolibrary.org/obo/NCIT_C67142 | Don't know |
## Identifier and Mapping Information
### Schema Source
* from schema: https://w3id.org/OHD/DFA-study/dfs
## LinkML Source
name: Frequency
description: Enumeration for frequency of occurrence
from_schema: https://w3id.org/OHD/DFA-study/dfs
rank: 1000
permissible_values:
'1':
text: '1'
description: Never
meaning: http://purl.obolibrary.org/obo/NCIT_C70543
'2':
text: '2'
description: Rarely
meaning: http://purl.obolibrary.org/obo/NCIT_C73116
'3':
text: '3'
description: Occasionally
meaning: http://purl.obolibrary.org/obo/NCIT_C151974
'4':
text: '4'
description: Very Often
meaning: http://purl.obolibrary.org/obo/NCIT_C91245
'8':
text: '8'
description: Don't know
meaning: http://purl.obolibrary.org/obo/NCIT_C67142