Description
Return age offset from a supplied month boundary.
Developmental-study observations use explicit trial, age, stimulus and missing-data conventions. Counterbalance flags and observation shares describe supplied research records; they do not establish actual stimulus presentation, an age correction appropriate for clinical use or a developmental assessment.
Return age offset from a supplied month boundary.
When to use this tool
Use Research Age Month Boundary Gap when checking the stated child-study observation, timing or record convention.
How to use the tool and how it works
- Enter ageMonths, suppliedBoundaryMonths. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read gapMonths. Use the output convention below.
Return age offset from a supplied month boundary. Require ageMonths/suppliedBoundaryMonths >= 0; gapMonths = age-boundary.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| ageMonths | Age Months | Required. Finite number; minimum 0. |
| suppliedBoundaryMonths | Supplied Boundary Months | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| gapMonths | Gap Months | Required. Finite number. |
{
"input": {
"ageMonths": 18.5,
"suppliedBoundaryMonths": 18
},
"output": {
"gapMonths": 0.5
}
}Limitations and assumptions
- The month-age convention and boundary are supplied; no real date, developmental milestone or clinical eligibility is inferred.
- 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 study protocol, actual observations and consent/assent records; use validated assessment and qualified professional judgment for developmental or care decisions.
References
Similar or alternative tools
- Research Visit Age Window Offset
Return corrected research age and margins to an age window.
- Research Task Look Window Gap
Compare looking-time overlap with a required task duration.