Description: Specifies the reason why grid co-ordinates were not assigned to an address.
This is a flat (unstructured) list which uses integers to represent categories or special values.
| Coding can be downloaded here as a tab-separated file. |
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| Coding | Meaning |
|---|---|
| -999 | Grid co-ordinates could not be assigned to address |
| -998 | Participant's address flagged as invalid |
| -997 | Grid co-ordinates redacted |
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