Description
Subtract birth for youngest and oldest age and return event-interval width.
Longitudinal ageing research links observations to people, waves, and sources. A person may appear in multiple records, so distinct-person coverage and record counts answer different questions and require explicit duplicate rules.
Subtract birth for youngest and oldest age and return event-interval width.
When to use this tool
Use Life Event Age Interval Width when you need a record-coverage or source-support diagnostic in ageing research.
How to use the tool and how it works
- Enter earliestEventCoordinate, latestEventCoordinate, birthCoordinate. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read youngestAge, oldestAge, width. Use the output convention below.
Require ordered possible event coordinates no earlier than birthCoordinate. Subtract birth for youngest and oldest age and return event-interval width.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| earliestEventCoordinate | Earliest Event Coordinate | Required. Finite number. |
| latestEventCoordinate | Latest Event Coordinate | Required. Finite number. |
| birthCoordinate | Birth Coordinate | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| youngestAge | Youngest Age | Required. Finite number. |
| oldestAge | Oldest Age | Required. Finite number. |
| width | Width or interval span on the measurement basis above. | Required. Finite number. |
{
"input": {
"earliestEventCoordinate": 1980,
"latestEventCoordinate": 1985,
"birthCoordinate": 1950
},
"output": {
"youngestAge": 30,
"oldestAge": 35,
"width": 5
}
}Limitations and assumptions
- Coordinates share units and uncertainty is supplied; these extrema do not imply a probability distribution, actual event timing, eligibility, or a clinical conclusion.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review the original study design, identifiers, and missing-data definitions. Use the full longitudinal dataset for inference rather than treating a local coverage flag as evidence of representativeness.
References
Similar or alternative tools
- Longevity Record Age Interval Width
Return observation minus each endpoint for minimum and maximum age days and divide by positive daysPerYear for age years.
- Life History Event Calendar Anchor Gap
Add recalledOffset to anchorYear for impliedYear and subtract that implied year from recalledYear for disagreementYears.