Description
Sample validated practice cases for Transcript Sync Offset Drift Seconds per Hour Estimator from an explicit candidate bank, returning separate prompts and calculator answers with repeat policy and replay metadata.
A worked-example generator selects educational cases from a finite bank supplied by the user. It validates those cases with an existing calculator and returns prompts separately from calculated answers. Sampling changes which eligible cases appear; it does not create a new scientific model or invent measurements.
Archival ratios and progress measures depend on a defined collection scope, reference period and denominator. Byte savings, transcription agreement and backlog processing measure different things; none alone establishes authenticity, completeness or preservation quality.
Calculator model: Estimate transcript-to-audio sync drift in seconds per hour from the change in alignment offset over the elapsed interview duration.1
When to use this tool
Use this generator when you already have candidate Transcript Sync Offset Drift Seconds per Hour Estimator inputs and want reproducible practice prompts with separately available calculator answers.
How to use the tool and how it works
- Prepare candidatesJson as distinct {id,input} records using the calculator fields and units below. Choose a replay seed, exercise count and repeat policy.
- Run the generator and read result.status and result.rejected before using the exercise list. Correct or deliberately exclude rejected candidates.
- Read each exercise’s prompt and separate answer. Keep result.model and result.replay with exported examples so units, source calculator and repeat policy remain explicit.
Validate each explicit candidate {id,input} through archival-studies/transcript-drift-per-hour-estimator before sampling. The calculator subtracts the starting alignment offset from the ending offset and divides by elapsed hours. The sign retains the direction of offset change; offsets are seconds and the starting offset defaults to zero when omitted. Keep successful prompt/answer pairs and structured rejections. Sample eligible IDs uniformly with the chosen replacement policy using one advancing source, then return separate prompts and actual calculator output objects with source indexes and model ports. Equal answers do not merge distinct candidate IDs.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| seed | Nonblank replay seed, at most 256 UTF-16 code units; an injected source overrides seeded draws. | Text, at most 8,192 UTF-16 code units; narrower grammar/range rules also apply. |
| count | Requested exercise count, integer 1–32. | Finite safe integer satisfying the stated bounds. |
| withoutReplacement | True selects distinct eligible candidate IDs; false allows an eligible ID to recur. | Boolean true or false. |
| candidatesJson | JSON text for at most 128 exact {id,input} records. id is a nonempty distinct string; input is an object for the linked calculator using the candidate fields below. Equal inputs/answers may have different IDs. | Text, at most 8,192 UTF-16 code units; narrower grammar/range rules also apply. |
Every candidate is evaluated before selection. count is 1–32; candidatesJson contains at most 128 records with exactly id and input keys. Duplicate or empty IDs, malformed bank records and invalid outer fields cause an input error. A base-calculator failure is retained in rejected rather than silently discarded.
If no candidate succeeds, status is empty-eligible-bank. If distinct selection requests more cases than succeed, status is insufficient-eligible-bank. Both return no exercises. Otherwise status is ok. Every selected answer is the actual output object of the linked calculator, not a fabricated answer inferred from a prompt.
Candidate conventions: elapsedHours must be positive. offsetStartSeconds defaults to zero when omitted; both offsets are signed seconds, and driftPerHour is seconds of offset change per playback hour.
| Candidate input field | Meaning | Required / type and units |
|---|---|---|
| offsetStartSeconds | Sync offset in seconds at the reference point. | Optional under the source contract. number |
| offsetEndSeconds | Sync offset in seconds at the later checkpoint. | Required. number |
| elapsedHours | Interview playback hours between the two checkpoints. | Required. number |
| Answer field | Meaning | Declared type and units |
|---|---|---|
| driftPerHour | Estimated drift in seconds per hour of playback. | number |
| totalDriftSeconds | Total offset change between the checkpoints. | number |
These decoded structures show the examples inside JSON text fields. Supply their serialized JSON strings as input.
{
"candidatesJson": [
{
"id": "canonical",
"input": {
"offsetEndSeconds": 4.5,
"elapsedHours": 3
}
}
]
}| Output field | Interpretation |
|---|---|
| result | Object containing the fields below. |
| result.status | ok, empty-eligible-bank or insufficient-eligible-bank. Non-ok banks return no exercises. |
| result.baseToolId | Canonical calculator ID used to validate and answer every candidate. |
| result.model | Underlying calculator description and actual input/output port definitions, including declared units. |
| result.replay | Seed, source kind, requested count/replacement policy and actual selection-source call count. |
| result.eligibleCandidateIds | All successfully validated candidate IDs in original candidate-bank order. |
| result.rejected | Original candidate ID/index and structured calculator or evidence-budget error. |
| result.exercises | Selected {candidateId,sourceIndex,prompt,answer} records in draw order; answers are actual calculator output objects. |
{
"input": {
"seed": "batch56-example",
"count": 1,
"withoutReplacement": true,
"candidatesJson": "[{\"id\":\"canonical\",\"input\":{\"offsetEndSeconds\":4.5,\"elapsedHours\":3}}]"
},
"output": {
"result": {
"status": "ok",
"baseToolId": "archival-studies/transcript-drift-per-hour-estimator",
"model": {
"description": "Estimate transcript-to-audio sync drift in seconds per hour from the change in alignment offset over the elapsed interview duration.",
"inputs": [
{
"description": "Sync offset in seconds at the reference point.",
"id": "offsetStartSeconds",
"label": "Start offset",
"required": false,
"valueType": {
"type": "number"
}
},
{
"description": "Sync offset in seconds at the later checkpoint.",
"id": "offsetEndSeconds",
"label": "End offset",
"required": true,
"valueType": {
"type": "number"
}
},
{
"description": "Interview playback hours between the two checkpoints.",
"id": "elapsedHours",
"label": "Elapsed hours",
"required": true,
"valueType": {
"type": "number"
}
}
],
"outputs": [
{
"description": "Estimated drift in seconds per hour of playback.",
"id": "driftPerHour",
"label": "Drift per hour",
"valueType": {
"type": "number"
}
},
{
"description": "Total offset change between the checkpoints.",
"id": "totalDriftSeconds",
"label": "Total drift",
"valueType": {
"type": "number"
}
}
]
},
"replay": {
"seed": "batch56-example",
"source": "seeded",
"count": 1,
"withoutReplacement": true,
"draws": 1
},
"eligibleCandidateIds": [
"canonical"
],
"rejected": [],
"exercises": [
{
"candidateId": "canonical",
"sourceIndex": 0,
"prompt": {
"offsetEndSeconds": 4.5,
"elapsedHours": 3
},
"answer": {
"totalDriftSeconds": 4.5,
"driftPerHour": 1.5
}
}
]
}
}
}Limitations and assumptions
- This selects practice cases from a supplied finite bank. The linked calculator’s model assumptions, required units and executable validation remain in force. Empty or too-small eligible banks return explicit statuses without fabricated exercises.
- A nonblank seed of at most 256 UTF-16 code units is required. With ordinary use the seed initializes one deterministic advancing source; an application-injected random source takes precedence and the seed alone then cannot replay the result. Uniformity statements assume independent uniform source draws in [0,1). Source calls are bounded and degenerate injected sources can fail a rejection budget. This is not cryptographically secure.
- Candidate inputs and answers remain subject to the linked calculator’s model assumptions. The sampler tests its executable contract, not real-world truth, calibration, fitness for a decision or scientific validity.
- Candidates whose prompt/answer exceed portable evidence bounds are rejected with a structured evidence-budget error. The complete selected output also has a bounded size and can fail if the combined evidence exceeds it.
- Every declared outer field is required and unknown outer fields are rejected. Strings and JSON text have size limits, lists are bounded to 128 entries, and JSON nesting/node counts are bounded. Tighter operation-specific bounds stated above take precedence.
- Numeric outputs must remain finite and within safe-integer magnitude. Original record indexes and cell coordinates are zero-based; stated half-open ranges exclude their end.
Alternative or Complementary methods
Use the linked calculator to inspect an individual candidate directly. Use this generator to select and package already supplied cases; build or review the exercise bank separately so topic coverage and difficulty reflect the teaching objective.
References
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