Description
Check event-time inclusion in a supplied risk interval.
Biostatistical terms depend on a declared observation unit, exposure denominator, event order and sampling design. A risk-set flag, paired discordance contribution or support-weight ratio can be computed locally without fitting a survival model, establishing a treatment effect or validating an inferential analysis.
Check event-time inclusion in a supplied risk interval.
When to use this tool
Use Risk Set Left Entry Equality Flag when checking the stated exposure, event, matched-pair or cluster-support convention.
How to use the tool and how it works
- Enter entryTime, exitTime, eventTime, entryInclusive, exitInclusive. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read atRisk. Inspect atRisk before interpreting the associated values.
Check event-time inclusion in a supplied risk interval. Require exitTime >= entryTime; atRisk applies entryInclusive and exitInclusive independently.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| entryTime | Entry Time | Required. Finite number. |
| exitTime | Exit Time | Required. Finite number. |
| eventTime | Event Time | Required. Finite number. |
| entryInclusive | Entry Inclusive | Required. Boolean. |
| exitInclusive | Exit Inclusive | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| atRisk | At Risk | Required. Boolean. |
{
"input": {
"entryTime": 10,
"exitTime": 20,
"eventTime": 10,
"entryInclusive": false,
"exitInclusive": true
},
"output": {
"atRisk": false
}
}Limitations and assumptions
- A coincident interval contains its point only with both flags; actual event order, observation and delayed-entry assumptions are not verified.
- 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
Analyze complete verified data with a method appropriate to the design and censoring assumptions; assess uncertainty and consult qualified statistical and clinical professionals for health conclusions.
References
Similar or alternative tools
- At Risk Window Entry Gap
Return overlap exposure with a supplied at-risk window.
- Survival Tie Censor Order Token
Return one survival factor under a tied censor/event order.