Description
Return a protocol window's center, half-width and observation offset.
Clinical research distinguishes supplied protocol metadata, participant/event records, allocation bookkeeping and an analysis target. A local count, permission flag or denominator choice can help reconcile records without establishing valid consent, randomization, regulatory compliance or a reliable treatment-effect estimate.
Return a protocol window's center, half-width and observation offset.
When to use this tool
Use Protocol Window Center Offset when checking the stated clinical-research record, allocation, timing, analysis or evidence-basis convention.
How to use the tool and how it works
- Enter observation, earliest, latest. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read center, signedOffset, halfWidth. Use the output convention below.
Return a protocol window's center, half-width and observation offset. Require earliest <= latest; center = earliest+(latest-earliest)/2, halfWidth = (latest-earliest)/2, signedOffset = observation-center.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| observation | Observation | Required. Finite number. |
| earliest | Earliest | Required. Finite number. |
| latest | Latest | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| center | Center | Required. Finite number. |
| signedOffset | Signed Offset | Required. Finite number. |
| halfWidth | Half Width | Required. Finite number. |
{
"input": {
"observation": 15,
"earliest": 10,
"latest": 30
},
"output": {
"center": 20,
"signedOffset": -5,
"halfWidth": 10
}
}Limitations and assumptions
- These are supplied numeric coordinates, not calendar-aware visit scheduling or clinical eligibility decisions.
- 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 complete approved protocol, authenticated source records and qualified clinical/statistical oversight for actual trial design, conduct and interpretation.
References
Similar or alternative tools
- Protocol Window Boundary Distance
Return signed distances from protocol-window boundaries.
- Research Visit Window Edge Closure
Check a visit against an explicitly bounded research window.