Description
Report whether a supplied research ratio and its real logarithm are numerically defined.
Assay ratios and reference comparisons require compatible units, molecular forms and calibration. A nonzero denominator or valid logarithm domain is a numerical property, not proof of measurement validity or a clinical interpretation.
Report whether a supplied research ratio and its real logarithm are numerically defined.
When to use this tool
Use Research Baseline Zero Domain when checking a supplied assay ratio, conversion or reference gap.
How to use the tool and how it works
- Enter baseline, observation. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ratioDefined, ratio, logRatioDefined. Inspect ratioDefined, logRatioDefined before interpreting the associated values.
Return ratioDefined = (baseline !== 0) and ratio = observation/baseline when defined, otherwise zero. logRatioDefined is true only for a nonzero baseline whose resulting ratio is positive; no logarithm is returned.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| baseline | Baseline | Required. Finite number. |
| observation | Observation | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ratioDefined | Whether baseline is nonzero. | Required. Boolean. |
| ratio | Ratio using the stated numerator and denominator convention. | Required. Finite number. |
| logRatioDefined | Whether the computed ratio would have a defined real natural logarithm; no logarithm is returned. | Required. Boolean. |
{
"input": {
"baseline": 0,
"observation": 2
},
"output": {
"ratioDefined": false,
"ratio": 0,
"logRatioDefined": false
}
}Limitations and assumptions
- Signed observations and baselines are accepted. A zero ratio placeholder is not a measured ratio, and numerical log-domain validity does not establish assay or clinical validity.
- 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 assay-specific calibration, molecular-form equivalence and appropriate clinical context before interpreting a result.
References
Similar or alternative tools
- Endocrine Signal Background Ratio
Return ratio = signal/background with both values on the same signal unit and calibration basis.
- Assay Unit Reference Factor
convertedValue = reportedValue*suppliedFactor; referenceGap = convertedValue-referenceValue.