Description
Return second looking duration relative to first.
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 second looking duration relative to first.
When to use this tool
Use Infant Stimulus Look Duration Ratio when checking the stated child-study observation, timing or record convention.
How to use the tool and how it works
- Enter firstLook, secondLook. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ratio, defined. Inspect defined before interpreting the associated values.
Return second looking duration relative to first. Require firstLook/secondLook >= 0; ratio = second/first when first positive, otherwise zero with defined false.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstLook | First Look | Required. Finite number; minimum 0. |
| secondLook | Second Look | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ratio | Ratio | Required. Finite number. |
| defined | Reporting flag under the explicit denominator or information policy above; inspect any zero placeholder or policy-defined value. | Required. Boolean. |
{
"input": {
"firstLook": 4,
"secondLook": 6
},
"output": {
"ratio": 1.5,
"defined": true
}
}Limitations and assumptions
- An undefined zero is a placeholder; this does not establish habituation, preference, attention or a clinical finding.
- 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
- Infant Trial Valid Gaze Term
Return infant gaze share under an occlusion policy.
- Observation Code Duration Share
Return a coded observation's target share under an exclusion policy.