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Add guidance for entering sample units #4

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briangow merged 1 commit into from
Apr 13, 2026
Merged

Add guidance for entering sample units #4

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6 changes: 5 additions & 1 deletion rmd/waveform-extension.Rmd
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Expand Up @@ -153,7 +153,11 @@ Iterate over each file's signal channels and extract per-channel metadata.
| 12 | unit_concept_id | int | Recommended | Populate for physical values (e.g., Hz, mmHg, mV) using OMOP standard units. Use unit lookup table or join against raw units found in header. |
| 13 | unit_source_value | string | Recommended | Raw unit string as it appeared in the source (e.g., "Hz", "mmHg", "uV"). Helps track unusual or non-standard units and improves auditability. |

### 6.3 Handling Conflicts
### 6.3 Common Issues & Solutions

- **Sample Amplitude Units** -> Set `metadata_source_value` = 'AMPLITUDE' (and use the corresponding `metadata_concept_id` from [WAVEFORM](https://github.com/TuftsCTSI/CVB/tree/main/WAVEFORM)), and all `value_as` fields to NULL. Fill in the unit columns with the unit for the sample amplitude for the channel.

### 6.4 Handling Conflicts

- **Multiple labels per channel** → Standardize via channel index
- **Conflicting sampling rates** → Default to most frequent or highest resolution
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