Description
Return the year-coordinate difference and reported age minus that difference.
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 the year-coordinate difference and reported age minus that difference.
When to use this tool
Use Retirement Survey Age Period Gap when you need a record-coverage or source-support diagnostic in ageing research.
How to use the tool and how it works
- Enter surveyYear, reportedAge, birthYear. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read yearDifference, ageGap. Use the output convention below.
Require nonnegative integer reportedAge and surveyYear no earlier than birthYear. Return the year-coordinate difference and reported age minus that difference.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| surveyYear | Survey Year | Required. Safe integer. |
| reportedAge | Reported Age | Required. Safe integer; minimum 0. |
| birthYear | Birth Year | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| yearDifference | Year Difference | Required. Safe integer. |
| ageGap | Age Gap | Required. Safe integer. |
{
"input": {
"surveyYear": 2026,
"reportedAge": 65,
"birthYear": 1960
},
"output": {
"yearDifference": 66,
"ageGap": -1
}
}Limitations and assumptions
- Year subtraction omits birthday timing, so a gap need not be an error; no date parsing, age verification, retirement eligibility, or clinical interpretation is performed.
- 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
- Cohort Age Period Birth Year Identity
Return periodYear-ageYears and subtract recordedBirthYear for identityResidual.
- Centenarian Age Document Date Gap
Return both age durations and documentedBirthDay-claimedBirthDay as discrepancyDays.