Description
Calculate replicate relative percent difference using absolute-value normalization.
Quality-control results depend on measurement basis, calibration reference, rounding, limit inclusion and decision rules. A raw result can lie on a different side of a boundary from its reported value. Guard bands and relative differences must retain their exact definitions; a local comparison does not select a valid specification or establish conformance.
Calculate replicate relative percent difference using absolute-value normalization.
When to use this tool
Use QC Replicate Relative Difference when you already have firstResult, secondResult and need to calculate replicate relative percent difference using absolute-value normalization.
How to use the tool and how it works
- Enter firstResult, secondResult. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read relativePercentDifference. Use the output convention below.
Require abs(first)+abs(second)>0; return 200*abs(first-second)/(abs(first)+abs(second)).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstResult | First Result | Required. Finite number. |
| secondResult | Second Result | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| relativePercentDifference | 200*abs(first-second)/(abs(first)+abs(second)); undefined when both results are zero. | Required. Finite number. |
{
"input": {
"firstResult": 8,
"secondResult": 12
},
"output": {
"relativePercentDifference": 40
}
}Limitations and assumptions
- Signed readings are allowed; the denominator differs from a signed mean convention, both zero is undefined, and no precision limit is selected.
- 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
Apply the documented measurement method, calibration records and complete decision rule when judging a result. Keep raw values, reported values, uncertainty and endpoint inclusion visible; a supplied guard band or replicate term does not select that rule.
References
Similar or alternative tools
- QC Result Rounding Boundary
Compare raw and reported results against the same supplied boundary.
- Paired Difference Reference Sign
Calculate a paired difference under an explicit reference direction.