C52 · Reference edition 2026.11
Missing and uncertain values — Layout and sequence
Not observed, not recorded and uncertain are different states. They should remain distinguishable from a numeric zero.
Scope and purpose
Place the relevant elements in a visible order before completing the record. A diagram should distinguish position from sequence and should preserve the orientation used in the written notes. Review the example for a practical way to make the relationship explicit.
Working notes
This atlas connects descriptive vocabulary, observation context and reference-sheet design. All example records are synthetic and exist to explain a method of documentation; they do not represent tested batches, product ratings or scientific results. The diagrams are original editorial graphics. Descriptions of perceived character are kept separate from ingredient, origin, health and certification claims. Read definitions and scale anchors before comparing records.
Practical example
Use separate status fields for missing context and uncertain attribute interpretation.
| Reference record | Interpretation |
|---|---|
| C52 | Missing and uncertain values |
| Scope and purpose | Not observed, not recorded and uncertain are different states. They should remain distinguishable from a numeric zero. |
| Limits and interpretation | A blank cell must not silently become a zero in a later chart. |
Review checklist
Identify the starting condition; mark the order or orientation; check that labels in the figure match the accompanying table.