Description
exposureFraction = seen/administrations.
Assessment coverage can refer to scored items, applicable items, observation counts or total weights. A support share depends on those choices and is separate from a final score, a validated scale or an inference about a learner.
exposureFraction = seen/administrations.
When to use this tool
Use Question Bank Exposure One Item Term when checking an explicit assessment or observation-support denominator.
How to use the tool and how it works
- Enter seen, administrations. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read exposureFraction. Use the output convention below.
Require whole administrations >= 1 and seen between zero and administrations. exposureFraction = seen/administrations.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| seen | Seen | Required. Safe integer; minimum 0. |
| administrations | Administrations | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| exposureFraction | Exposure Fraction | Required. Finite number. |
{
"input": {
"seen": 20,
"administrations": 100
},
"output": {
"exposureFraction": 0.2
}
}Limitations and assumptions
- The denominator is administrations, not necessarily distinct learners. It does not detect item leakage, estimate exposure risk or determine a bank-security threshold.
- 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 the assessment design, missing-item policy and observation method before interpreting coverage as valid achievement evidence.
References
Similar or alternative tools
- Item Observation Support Share
applicableWeight sums applicable items; observedWeight additionally requires observed.
- Test Item Unscored Weight Budget
Separate total assessment weight into scored and unscored portions.