Description
Subtract blank from signal and return separate negative and exact-zero flags.
A residual is the signed difference between an observation and a declared reference or blank. Retaining its sign is useful for detecting overcorrection and incompatible measurement bases.
Subtract blank from signal and return separate negative and exact-zero flags.
When to use this tool
Use Microbial Blank Negative Case Token when you need an explicit assay residual or supported-count comparison.
How to use the tool and how it works
- Enter signal, blank. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read difference, negative, zero. Inspect negative, zero before interpreting the associated values.
Subtract blank from signal and return separate negative and exact-zero flags.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| signal | Signal | Required. Finite number. |
| blank | Blank | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| difference | Difference | Required. Finite number. |
| negative | Negative | Required. Boolean. |
| zero | Zero | Required. Boolean. |
{
"input": {
"signal": 2,
"blank": 3
},
"output": {
"difference": -1,
"negative": true,
"zero": false
}
}Limitations and assumptions
- Use matching signal units; values are not censored, rounded, or interpreted against a detection limit.
- 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
Inspect measurement uncertainty, reporting qualifiers, and the original laboratory records before interpreting a discrepancy.
References
Similar or alternative tools
- Microbial Biomass Dry Mass Volume Factor
Subtract filterTare and blankNetMass from grossDryMass for netDryMass, then divide by positive sampleVolume.
- Microbial Count Recovery Supplied Factor
Subtract backgroundCount from observedCount, divide by recoveryFraction in (0, 1], and divide again by positive originalVolume for perVolume.