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1. ab-testing-cookie-cats ab-testing-cookie-cats Public

   A/B test analysis of Cookie Cats gate placement (level 30 vs 40). Two-sample proportion tests, Mann-Whitney U, bootstrap CIs, power analysis. Finding: gate_40 caused D7 retention drop of 0.82pp (p=…

   Jupyter Notebook

2. personal-ai-intelligence-tool personal-ai-intelligence-tool Public

   Sipply — Full-stack AI news aggregator. Next.js + FastAPI + PostgreSQL. 11-stage daily pipeline: ingest → ML score → cluster → LLM summarize → email digest. TF-IDF scorer (Pearson r=0.75), bilingua…

   Python

3. recommender_system recommender_system Public

   Large-scale news recommendation system on 3M+ user-item interactions (300K users). Item-CF / User-CF collaborative filtering + LightGBM CTR re-ranking. Multi-stage pipeline: embedding retrieval → g…

   Jupyter Notebook

4. stocktrader stocktrader Public

   Two competing LLM-powered trading agents (Momentum vs Contrarian) + an Evaluator agent. JSON-structured outputs, Yahoo Finance integration. Dual-strategy debate architecture driven by Claude API.

   Python

5. RFM RFM Public

   End-to-end customer segmentation: RFM feature engineering → K-Means clustering → VIP / frequent / at-risk segments. Top 20% customers generate 74.6% revenue and 85.7% estimated LTV. Includes decisi…

   Jupyter Notebook

6. UN-Hackathon-GEO-Insight UN-Hackathon-GEO-Insight Public

   Solo 48h · CMU × Databricks × UN OCHA Hackathon 2026. Agentic AI ranks 77 countries by humanitarian funding gap — MCDM Gap Score, ReAct agent with bias guardrails, MLflow 3 tracing, LLM-as-Judge ev…

   Python