About Exam Analytics

Methodology, licensing, and attribution

What is Exam Analytics?

Exam Analytics (Beta) is a lightweight, self-contained web application designed for educators and assessment professionals to analyze multiple-choice exams quickly and accurately.

Version

1.0.0 (Beta)

Release Date

2025

Key Features

  • Classical Test Theory (CTT) statistics
  • Item difficulty and discrimination indices
  • KR-20 reliability coefficient
  • Distractor analysis
  • Privacy-first: all processing in-browser
  • No external dependencies or CDNs
  • Fully accessible (WCAG 2.1 AA)

Methodology Summary

This application implements Classical Test Theory (CTT) methods for analyzing multiple-choice assessments. All statistical calculations are performed using standard psychometric formulas.

Analysis Components

1. Scoring

Each item is scored dichotomously (1 = correct, 0 = incorrect). Total scores are computed by summing item scores for each student.

2. Item Difficulty

The proportion (p) of students answering correctly. Values range from 0 (no one correct) to 1 (everyone correct). Optimal difficulty for norm-referenced tests is typically 0.5–0.7.

3. Item Discrimination

Point-biserial correlation (r_pb) between item performance and total test score. Higher values indicate better discrimination between high and low performers.

4. Reliability

Kuder-Richardson Formula 20 (KR-20) estimates internal consistency for dichotomously scored items. Values ≥ 0.7 are generally considered acceptable for low-stakes assessments.

5. Distractor Analysis

Examines the frequency with which each option was selected. Effective distractors should attract at least 5% of responses; otherwise, they are flagged as non-functioning.

Note: This application is designed for educational and formative assessment purposes. For high-stakes testing, consult a qualified psychometrician.

License & Attribution

Application Code

All application code (HTML, CSS, JavaScript, PHP) is written from scratch with no external libraries or frameworks.

Important: This software is provided for educational and evaluation purposes only. No proprietary reuse is permitted without explicit authorization.

Bundled Assets

Asset Type License Source
Fonts System fonts only User's operating system
Icons/Logo Custom SVG (inline) Created specifically for this application
Emoji Unicode Standard User's operating system

Privacy & Data Policy

  • No data is transmitted to external servers
  • No cookies are set (except browser localStorage for autosave)
  • No analytics or tracking scripts
  • No third-party integrations
  • All processing happens locally in your browser

Accessibility Commitment

This application is designed to meet WCAG 2.1 Level AA success criteria:

  • ✓ Keyboard navigation for all interactive elements
  • ✓ Focus-visible indicators
  • ✓ Skip to main content link
  • ✓ Semantic HTML and ARIA landmarks
  • ✓ Sufficient color contrast ratios
  • ✓ High-contrast theme option
  • ✓ Respects prefers-reduced-motion
  • ✓ Form labels and error messages
  • ✓ Responsive design (360px+)
If you encounter accessibility barriers, please report them via the project repository.

Support & Feedback

This is a beta release. If you encounter issues or have suggestions for improvement, please provide feedback through appropriate channels.

Disclaimer: This software is provided "as is" without warranty of any kind. Use at your own risk. Always verify results against manual calculations for critical assessments.