Description
Return natural-log exposure offset relative to a reference.
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.
Return natural-log exposure offset relative to a reference.
When to use this tool
Use Exposure Offset Log Term when checking the stated exposure, event, matched-pair or cluster-support convention.
How to use the tool and how it works
- Enter exposure, suppliedReferenceExposure. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read logOffset, exposureRatio. Use the output convention below.
Return natural-log exposure offset relative to a reference. Require both exposure/reference > 0; exposureRatio = exposure/reference, logOffset = ln(exposure)-ln(reference).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| exposure | Exposure | Required. Finite number; strictly above 0. |
| suppliedReferenceExposure | Positive exposure reference on the same time/measurement basis as exposure. | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| logOffset | Log Offset | Required. Finite number. |
| exposureRatio | Exposure Ratio | Required. Finite number. |
{
"input": {
"exposure": 20,
"suppliedReferenceExposure": 5
},
"output": {
"logOffset": 1.3862943611198906,
"exposureRatio": 4
}
}Limitations and assumptions
- Exposure units must match; this is an offset term, not a fitted Poisson model, rate estimate or justified sampling design.
- 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
- Trial Stratum Zero Event Domain
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- Study Treatment Policy Exposure Label
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