# C938 — Derive the aggregate-digit measurement

## Question

How much component information determines the reversed total?

## Inputs

```json
{}
```

## Sources

```json
[
  "C933–937;declared decimal register"
]
```

## Opened utc

2026-09-28T03:37:55.888444+00:00

## Results

```json
{
  "aggregates": {
    "regular": [
      2,
      6,
      10
    ],
    "cumulative": [
      12,
      5,
      10
    ]
  },
  "artifact": {
    "path": "model/junction_aggregate_digits.json",
    "sha256": "47b2822a45807d8dc2e74dee75eba52bf5fcdf3da83a0e05348f2fde6f27285f",
    "bytes": 482
  }
}
```

## Finding

For these four-digit durations with exactly one trailingzero, the whole component evaluation depends only on three digit-column sums. Individual component digits contain additional information about the internal breakpoint, but are unnecessary for the outer transformed total.

## Reassessment

Classify the aggregate possibilities for the regular2700 total before selecting a breakpoint.

## Checks

```json
{
  "source_totals": true,
  "evaluated_totals": true
}
```

## Closed utc

2026-09-28T03:37:55.888793+00:00

## Record provenance

Exact record hash: `878e931853c663576d5ca732421d1bd23cd87002b558f143dd3b0bb5d5f87c73`

Source journal: `Research_Cycles/C0932_C1131/journal.json`