How Item Analysis Calculator works

1. Enter or select your source information.
2. Review validation messages before calculating or planning an operation.
3. Inspect the output and verify assumptions.
4. Use the available print or export action to keep a copy.

Item Analysis Calculator

Item Analysis Calculator provides descriptive indicators to support teacher review. Enter the number of valid responses and the number correct for each item, or use the upper and lower group counts to calculate a simple discrimination index. Difficulty is calculated as the proportion of valid responses that are correct. Upper-lower discrimination is the upper-group proportion correct minus the lower-group proportion correct. Results are indicators, not automatic judgments that an item is good or bad. Sample size, curriculum alignment, distractor quality and classroom context still matter. Calculations run locally and are not uploaded.

Use the tool as a starting point, verify outputs before relying on them, and keep a separate copy of important source data. The interface is designed to work in the browser without an account. The calculations and file checks are intended to make routine work easier, not replace professional judgment or your organization's policies. Before printing, sharing, or issuing an output, review the details carefully and keep a separate backup of important records. This beta release should be tested with representative examples before you depend on it for time-sensitive work. Features that are not yet implemented are disclosed in the interface rather than shown as working controls.