Add Logistic Regression interactive lesson in Vietnamese

[LMK89]

Summary

Added a comprehensive interactive educational lesson on Logistic Regression in Vietnamese, including theory, practical examples, interactive demos, and self-assessment quizzes.

Key Changes

• New lesson file: 2026-08-27-logistic-regression-33a99007.html — A complete standalone HTML lesson covering:

  • Quick warmup quiz (3 questions) to assess prior knowledge
  • Definition and core concepts of logistic regression vs linear regression
  • Real-world case study: diabetes risk screening
  • 4 progressive states showing common pitfalls and improvements (linear regression misuse, basic logistic regression, threshold tuning, L2 regularization)
  • Comparative summary table
  • Interactive step-by-step demo allowing users to input patient data and see sigmoid calculation, probability output, and threshold-based prediction
  • Data quality guidelines (good vs bad data)
  • 3-question self-grading quiz with immediate feedback

• Interactive features:

  • Dark/light theme toggle with localStorage persistence
  • Real-time sigmoid calculation demo with animated step-by-step breakdown
  • Threshold adjustment to explore precision/recall tradeoffs
  • Random data generator for experimentation
  • Animated feedback and scoring system

• Updated README: Added entry for the new lesson in the course index table

Implementation Details

• Responsive design using CSS Grid and Flexbox (mobile-first)
• CSS custom properties for theming (light/dark modes)
• Vanilla JavaScript for all interactivity (no external dependencies)
• Semantic HTML5 structure with accessibility considerations
• Illustrative ASCII diagrams to visualize concepts
• Educational scaffolding: warmup → theory → examples → interactive demo → assessment

https://claude.ai/code/session_01JwhB5xC1d6P8Hvxbdne3ju