Description
score is zero if omitted, one if correct, otherwise -1/(alternatives-1).
Scoring rules combine points, item weights, boundaries and policies for omission, extra credit or missing items. A computed mark is meaningful only under those explicit rules; applying a rule does not establish its fairness or official status.
score is zero if omitted, one if correct, otherwise -1/(alternatives-1).
When to use this tool
Use Guessing Corrected Score One Item when checking one supplied scoring contribution or policy boundary.
How to use the tool and how it works
- Enter correct, omitted, alternatives. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read score. Use the output convention below.
Require whole alternatives >= 2 and reject simultaneous correct and omitted. score is zero if omitted, one if correct, otherwise -1/(alternatives-1).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| correct | Correct | Required. Boolean. |
| omitted | Omitted | Required. Boolean. |
| alternatives | Alternatives | Required. Safe integer; minimum 2. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| score | Score | Required. Finite number. |
{
"input": {
"correct": false,
"omitted": false,
"alternatives": 4
},
"output": {
"score": -0.3333333333333333
}
}Limitations and assumptions
- This is one conventional guessing-correction rule. It assumes a supplied alternative count and does not model partial knowledge, item quality or an institution's actual marking policy.
- 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
Use the complete approved rubric and score record for an official outcome, and examine measurement quality separately.
References
Similar or alternative tools
- Mastery Cut Score Distance One Student
Compare one score with a supplied mastery cut under an explicit equality rule.
- Rubric Item Point Share
share = itemPoints/totalAvailable.