Description
Return age at a supplied longitudinal wave and its target offset.
Chronological, corrected and age-equivalent values use different anchors and assumptions. Arithmetic can compare supplied age coordinates, but a clinical correction or interpretation of developmental delay is not determined by subtraction alone.
Return age at a supplied longitudinal wave and its target offset.
When to use this tool
Use Longitudinal Study Age Wave Offset when checking a supplied research age anchor or offset.
How to use the tool and how it works
- Enter baselineAgeMonths, elapsedMonths, targetWaveAgeMonths. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read observedAgeMonths, targetOffsetMonths. Use the output convention below.
Return age at a supplied longitudinal wave and its target offset. Require nonnegative baselineAgeMonths, elapsedMonths and targetWaveAgeMonths; observed age is baseline+elapsed and offset subtracts target.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| baselineAgeMonths | Baseline Age Months | Required. Finite number; minimum 0. |
| elapsedMonths | Elapsed Months | Required. Finite number; minimum 0. |
| targetWaveAgeMonths | Target Wave Age Months | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| observedAgeMonths | Observed Age Months | Required. Finite number. |
| targetOffsetMonths | Target Offset Months | Required. Finite number. |
{
"input": {
"baselineAgeMonths": 12,
"elapsedMonths": 7,
"targetWaveAgeMonths": 18
},
"output": {
"observedAgeMonths": 19,
"targetOffsetMonths": 1
}
}Limitations and assumptions
- Months are numeric study coordinates, not calendar-derived intervals or developmental norms.
- 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
Use the appropriate professional guidance and validated assessment before interpreting corrected or age-equivalent values for an individual.
References
Similar or alternative tools
- Participant Age Correction Offset
Return corrected recorded age and offset from a target.
- Developmental Study Corrected Age Anchor
Return a supplied prematurity correction and resulting age.