Description
Return observation minus each endpoint for minimum and maximum age days and divide by positive daysPerYear for age years.
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.
Return observation minus each endpoint for minimum and maximum age days and divide by positive daysPerYear for age years.
When to use this tool
Use Longevity Record 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 earliestBirthDay, latestBirthDay, observationDay, daysPerYear. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read minimumAgeDays, maximumAgeDays, widthDays, minimumAgeYears, maximumAgeYears. Use the output convention below.
Require ordered possible birth-day coordinates and observationDay at least the latest. Return observation minus each endpoint for minimum and maximum age days and divide by positive daysPerYear for age years.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| earliestBirthDay | Earliest Birth Day | Required. Safe integer. |
| latestBirthDay | Latest Birth Day | Required. Safe integer. |
| observationDay | Observation Day | Required. Safe integer. |
| daysPerYear | Positive caller-supplied constant days/year; not a calendar-birthday calculation. | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| minimumAgeDays | Minimum Age Days | Required. Safe integer. |
| maximumAgeDays | Maximum Age Days | Required. Safe integer. |
| widthDays | Width Days | Required. Safe integer. |
| minimumAgeYears | Minimum Age Years | Required. Finite number. |
| maximumAgeYears | Maximum Age Years | Required. Finite number. |
{
"input": {
"earliestBirthDay": 1000,
"latestBirthDay": 1030,
"observationDay": 37500,
"daysPerYear": 365
},
"output": {
"minimumAgeDays": 36470,
"maximumAgeDays": 36500,
"widthDays": 30,
"minimumAgeYears": 99.91780821917808,
"maximumAgeYears": 100
}
}Limitations and assumptions
- The year conversion uses a supplied constant rather than actual calendar birthdays; input records, longevity claims, and clinical implications are not verified.
- 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 Date Precision Interval
Return endEarliest-birthLatest and endLatest-birthEarliest as duration bounds.
- Life Event Age Interval Width
Subtract birth for youngest and oldest age and return event-interval width.