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Education · Grading & assessment

Assessment Item Analysis Calculator

Analyze one selected-response item from student-level responses using difficulty, discrimination, point-biserial association, omissions, and group comparisons.

Education · Grading & assessment

Enter the education scenario

Private in-browser workflow · no account, upload, or saved academic record
Student item responses

Use short non-identifying labels. Status, policy, and omit words must match the examples and calculator guidance. Rows remain in this browser tab.

Use non-identifying labels where records repeat and enter the policy, scale, score, or planning assumptions that actually apply. Missing, excused, pending, late, zero, and omitted values are different states. Nothing entered here is added to a URL, account, analytics event, or saved academic record.

Education workflow result

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Enter valid values to see the result.

Your entries are calculated in this browser and are not submitted to 365CALCS.COM.

Quick guide

How to use this calculator

  1. Choose the explicit policy, scale, scoring basis, or planning method before entering results.
  2. Use the labelled fields and add one structured row per course, attempt, component, criterion, learner record, unit, or workload batch that belongs in the scenario.
  3. Read component outputs before the overall summary: they expose denominators, active weights, exclusions, shortages, thresholds, provenance, and the record or stage driving the result.

Calculation method

Transparent education workflow

Difficulty = correct responses ÷ valid responses; discrimination compares upper and lower groups; point-biserial is the Pearson correlation between item score and total score.

The calculator preserves relevant distinctions and reports intermediate components rather than converting missing information into an assumed score, policy, equivalency, or approval.

Worked example

Worked example

If 18 of 24 valid responses are correct, item difficulty is 0.75 before examining whether the item discriminates between higher and lower total scores.

Difficulty = correct responses ÷ valid responses; discrimination compares upper and lower groups; point-biserial is the Pearson correlation between item score and total score.

Supported inputs

Precision and limits

Visitor-entered rules and assumptions

No grading scale, attendance threshold, late-work rule, mastery definition, institutional conversion, admissions requirement, curriculum rule, or room-safety standard is supplied automatically.

Privacy by default

Use short non-identifying labels. Entered academic information and results stay in this browser tab and are not placed in URLs, analytics, storage, session replay, or a cloud record.

Support, not automated judgement

Results organize arithmetic evidence. They do not rank learners, diagnose learning, predict admission, determine placement, recommend discipline, certify safety, or replace professional and institutional judgement.

Calculator-specific boundary

Small samples, ties, multidimensional tests, guessing, instruction, accessibility, and content validity affect interpretation. Statistics diagnose evidence; they do not automatically prove an item should be retained or removed.

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